EV MARATHON GOLD & NATURAL RESOURCES FUND
497, 1995-03-30
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<PAGE>
                   EV Marathon Gold & Natural Resources Fund
                                   Supplement
                      to Prospectus dated February 1, 1995


         Under the section  entitled  "Management  of the Fund",  the  following
paragraph replaces the existing paragraph identifying the portfolio manager:

                  William  D. Burt and  Barclay  Tittmann  are the  co-portfolio
         managers of the Fund. Mr. Burt joined Eaton Vance  Management as a Vice
         President in November,  1994. Previously he was a Vice President of The
         Boston Company (1990-1994) and a Vice President of Baring America Asset
         Management (1979-1990). Mr. Tittmann joined Eaton Vance Management as a
         Vice  President in October,  1993. He was a Vice  President,  portfolio
         manager and analyst with  Invesco  Management  and  Research  (formerly
         Gardner and Preston Moss) from 1970-1993.



March 31, 1995                                                            M-NRPS
<PAGE>
                  EV MARATHON GOLD & NATURAL RESOURCES FUND

    EV MARATHON GOLD & NATURAL RESOURCES FUND (THE "FUND") IS A MUTUAL FUND
SEEKING CAPITAL APPRECIATION AND PROTECTION OF PURCHASING POWER THROUGH
NATURAL RESOURCE RELATED INVESTMENTS.

    Shares of the Fund are not  deposits of, or  guaranteed  or endorsed by, any
bank or other insured depository  institution,  and are not federally insured by
the Federal  Deposit  Insurance  Corporation,  the Federal  Reserve Board or any
other government agency. Shares of the Fund involve investment risks,  including
fluctuations  in value  and the  possible  loss of some or all of the  principal
investment.

    This Prospectus is designed to provide you with  information you should know
before investing.  Please retain this document for future reference. A Statement
of Additional  Information  for the Fund dated February 1, 1995, as supplemented
from time to time, has been filed with the  Securities  and Exchange  Commission
and is incorporated herein by reference. The Statement of Additional Information
is available without charge from the Fund's Principal  Underwriter,  Eaton Vance
Distributors,  Inc.,  24  Federal  Street,  Boston,  MA 02110  (telephone  (800)
225-6265).  The  Fund's  investment  adviser  is  Eaton  Vance  Management  (the
"Investment Adviser") which is located at the same address.

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THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE  COMMISSION OR ANY STATE  SECURITIES  COMMISSION NOR HAS THE SECURITIES
AND  EXCHANGE  COMMISSION  OR ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
------------------------------------------------------------------------------
<TABLE>
<CAPTION>

                                              TABLE OF CONTENTS
                                                   Page                                                 Page
<S>                                                <C>   <C>                                            <C>
Shareholder and Fund Expenses .....................   2  How to Buy Fund Shares ........................  17
The Fund's Financial Highlights ...................   3  How to Redeem Fund Shares .....................  18
The Fund's Investment Objective ...................   4  Reports to Shareholders .......................  20
How the Fund Invests Its Assets ...................   4  The Lifetime Investing Account/Distribution
Special Considerations ............................   8    Options .....................................  20
Organization of the Fund ..........................  12  The Eaton Vance Exchange Privilege ............  21
Management of the Fund ............................  13  Eaton Vance Shareholder Services ..............  22
Distribution Plan .................................  13  Distributions and Taxes .......................  24
Valuing Fund Shares ...............................  16  Performance Information ......................   25
</TABLE>

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                      PROSPECTUS DATED FEBRUARY 1, 1995


<PAGE>
SHAREHOLDER AND FUND EXPENSES
------------------------------------------------------------------------------
<TABLE>
<S>                                                                                                  <C>
SHAREHOLDER TRANSACTION EXPENSES
  Sales Charges Imposed on Purchases of Shares                                                           None
  Sales Charges Imposed on Reinvested Distributions                                                      None
  Fees to Exchange Shares                                                                                None
  Range of Declining Contingent Deferred Sales Charges Imposed on Redemption During the
    First Seven Years (as a percentage of redemption proceeds exclusive of all
    reinvestments and capital appreciation in the account)<F2>                                       5.00%-0%
ANNUAL FUND OPERATING EXPENSES
(as a percentage of average daily net assets)
  Investment Adviser Fee                                                                               0.750%
  Rule 12b-1 Distribution (and Service) Fees                                                           0.833%
  Other Expenses                                                                                       1.057%
                                                                                                       -----
    Total Operating Expenses                                                                           2.640%
                                                                                                       =====
<CAPTION>
EXAMPLE                                                               1 YEAR         3 YEARS        5 YEARS       10 YEARS
                                                                      ------         -------        -------       --------
<S>                                                                   <C>            <C>            <C>           <C>
An  investor  would pay the  following  contingent  deferred
  sales  charge  and expenses on a $1,000 investment,
  assuming (a) 5% annual return and (b) redemption at the end
  of each period:                                                       $77           $122           $160           $297
An investor would pay the following expenses on the same
investment, assuming (a) 5% annual return and (b) no redemptions:       $27           $ 82           $140           $297

<FN>
Notes:
<F1> The  purpose  of the above  table and  Example  is to assist  investors  in
     understanding the various costs and expenses that investors in the Fund may
     bear directly or indirectly. The percentages indicated in the table and the
     amounts  included in the Example are based on the Fund's  fiscal year ended
     September  30,  1994.  The table and  Example  should not be  considered  a
     representation  of past or  future  expenses  and  actual  expenses  may be
     greater or less than those shown.  For further  information  regarding  the
     expenses of the Fund, see "The Fund's Financial Highlights", "Management of
     the Fund" and "How to Redeem Fund Shares."  Because the Fund makes payments
     under  its  Distribution   Plan  adopted  under  Rule  12b-1,  a  long-term
     shareholder  may pay  more  than the  economic  equivalent  of the  maximum
     front-end sales charge  permitted by a rule of the National  Association of
     Securities Dealers, Inc. See "Distribution Plan."

<F2> No contingent deferred sales charge is imposed on (a) shares purchased more
     than six years prior to the  redemption,  (b) shares  acquired  through the
     reinvestment  of dividends and  distributions  and (c) any  appreciation in
     value of other shares in the account (see "How to Redeem Fund Shares"), and
     no such  charge is imposed on  exchanges  of Fund  shares for shares of the
     funds currently listed under "The Eaton Vance Exchange Privilege".
</TABLE>
<PAGE>
THE FUND'S FINANCIAL HIGHLIGHTS
------------------------------------------------------------------------------
     The following  information should be read in conjunction with the financial
statements included in the Statement of Additional Information, all of which has
been so  included  in  reliance  upon the  report  of  Deloitte  &  Touche  LLP,
independent certified public accountants, as experts in accounting and auditing.
Further  information  regarding the  performance of the Fund is contained in the
Fund's annual report to  shareholders  which may be obtained  without  charge by
contacting the Fund's Principal Underwriter, Eaton Vance Distributors, Inc.
------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                             YEAR ENDED SEPTEMBER 30,
                      -------------------------------------------------------------------------------------------------------
                            1994           1993           1992           1991           1990           1989          1988<F2>
                            ----           ----           ----           ----           ----           ----          ------
<S>                        <C>            <C>            <C>            <C>            <C>            <C>            <C>    
NET ASSET VALUE,
  beginning of year        $13.240        $11.850        $11.140        $12.140        $13.460        $11.420        $10.000
                           -------        -------        -------        -------        -------        -------        -------
INCOME FROM
OPERATIONS:
  Net investment           
    income (loss) ..       $(0.050)       $(0.090)       $(0.083)       $ 0.020        $ 0.069        $ 0.060        $ 0.134
  Net realized and
    unrealized gain
    (loss) on
    investments ....         2.650          1.480          1.103         (0.570)        (0.009)         2.480          1.406
                           -------        -------        -------        -------        -------        -------        -------
    Total income
      from investment
      operations ...       $ 2.600        $ 1.390        $ 1.020        $(0.550)       $ 0.060        $ 2.540        $ 1.540
                           -------        -------        -------        -------        -------        -------        -------
LESS DISTRIBUTIONS FROM:
  Net investment
    income .........       $  --          $  --          $  --          $(0.020)       $(0.069)       $(0.074)       $(0.120)
  Net realized gain
    on investments .          --             --           (0.060)        (0.320)        (1.220)        (0.280)          --
  In excess of net
    investment income<F4>   (0.020)          --           (0.250)        (0.110)        (0.091)        (0.146)          --
  In excess of
    realized gain on
    investment .....        (0.930)          --             --             --             --             --             --
                           -------        -------        -------        -------        -------        -------        -------
    Total 
      distributions        $(0.950)       $ --           $(0.310)       $(0.450)       $(1.380)       $(0.500)       $(0.120)
                           -------        -------        -------        -------        -------        -------        -------
NET ASSET VALUE, end
  of year ..........       $14.890        $13.240        $11.850        $11.140        $12.140        $13.460        $11.420
                           =======        =======        =======        =======        =======        =======        =======
TOTAL RETURN<F5>....        20.47%         11.73%          9.44%        (4.36)%          0.01%         22.96%         15.39%
RATIOS/SUPPLEMENTAL DATA<F1>:
  Net assets, end of
    year (000 omitted)     $13,055        $ 5,792        $ 3,775        $ 4,042        $ 4,391        $ 2,999        $ 2,424
  Ratio of net
    expenses to
    average daily
    net assets .....         2.64%          3.15%          3.26%          3.29%          2.50%          1.62%          0.99%<F3>
  Ratio of net
    investment income        
    (loss) to
    average daily net
    assets .........       (0.96)%        (0.92)%        (0.67)%          0.17%          0.33%          0.45%          0.83%<F3>
PORTFOLIO TURNOVER .           17%            57%            32%            27%            35%            53%            25%
<FN>
<F1> For the six years ended  September 30, 1993, the operating  expenses of the
     Fund reflect a reduction of the  investment  adviser fee, an  allocation of
     expenses to the  Investment  Adviser,  or both.  Had such  actions not been
     taken,  net  investment  income per share and the ratios would have been as
     follows:
NET INVESTMENT
  INCOME (LOSS) PER
  SHARE ............                      $(0.210)       $(0.240)       $(0.110)       $(0.300)       $(0.600)       $(0.980)
                                          =======        =======        =======        =======        =======        =======
RATIOS (As a percentage of
 average daily net assets):
   Expenses ......                           3.90%          4.65%          4.42%          5.23%          6.87%          7.90%<F3>
   Net investment
     income (loss) .                       (1.67)%        (2.06)%        (0.96)%        (2.40)%        (4.80)%        (6.08)%<F3>
<FN>
<F2> For the period from the start of business,  October 21, 1987,  to September
     30, 1988.
<F3> Computed on an annualized basis.
<F4> Distributions  from paid-in  capital for the years ended September 30, 1992
     and for the years prior  thereto  have been  restated  to conform  with the
     treatment under current financial reporting standards.
<F5> Total  return is  calculated  assuming a purchase at the net asset value on
     the  first  day and a sale at the net  asset  value on the last day of each
     period.  Dividends and distributions,  if any, are assumed to be reinvested
     at the net asset value on the reinvestment date.
</TABLE>
<PAGE>
THE FUND'S INVESTMENT OBJECTIVE
------------------------------------------------------------------------------
THE FUND'S  INVESTMENT  OBJECTIVE IS CAPITAL  APPRECIATION AND PROTECTION OF THE
PURCHASING  POWER OF THE  SHAREHOLDER'S  CAPITAL.  The Fund will concentrate its
assets in natural resource related  investments and may engage in various active
management strategies,  as described below. Although the Fund will derive income
from some of its investments,  current income is not an investment objective and
will not be a primary  consideration  in  selecting  securities  for the  Fund's
portfolio.  There can be no assurance  that the Fund will achieve its investment
objective.  The  Fund's  investment  adviser,  Eaton  Vance  Management  ("Eaton
Vance"), will manage its investments and affairs.

     Except as otherwise indicated in this Prospectus,  the investment objective
and  policies  of the Fund may be changed by the  Trustees  of the Fund  without
shareholder approval, although the Trustees intend to submit material changes in
the investment objective to shareholders for their approval. If any changes were
made, the Fund might have  investment  objectives  different from the objectives
which an  investor  considered  appropriate  at the time the  investor  became a
shareholder in the Fund.

HOW THE FUND INVESTS ITS ASSETS
------------------------------------------------------------------------------

BASIC INVESTMENT STRATEGIES.  The Fund seeks to achieve its investment objective
through  a  portfolio  of  domestic  and  foreign   natural   resource   related
investments.  Under normal  investment  conditions the Fund expects that it will
invest  primarily  in common  stocks,  but it may also hold  convertible  bonds,
convertible preferred stocks, warrants,  preferred stocks and debt securities if
Eaton  Vance  believes  such  investments  would  help  to  achieve  the  Fund's
investment objective. The Fund may also invest in debt, preferred or convertible
securities,  the value of which is related to the market  value of some  natural
resource asset  ("asset-related  securities").  See "Special  Considerations  --
Asset-Related Securities" below. In making investments for the Fund, Eaton Vance
will seek to identify  companies  or  asset-related  securities  it believes are
attractively  priced relative to the intrinsic  value of the underlying  natural
resource  assets,  revenues  or profits or are  especially  well  positioned  to
benefit during particular periods of investment or inflationary cycles.

    The Fund may also from time to time  invest to a limited  extent in  natural
resource-related  direct placement  securities and venture capital companies and
in gold or silver  bullion,  strategic  metals,  and gold or silver  coins.  See
"Direct Placement Securities and Venture Capital Investments" and "Metals
Investments" below.

    WHEN EATON VANCE ANTICIPATES  SIGNIFICANT ECONOMIC OR POLITICAL INSTABILITY,
SUCH AS HIGH INFLATION OR TURMOIL IN THE FOREIGN CURRENCY EXCHANGE MARKETS,  THE
FUND, IN SEEKING TO PROTECT THE PURCHASING POWER OF SHAREHOLDERS'  CAPITAL,  MAY
INVEST A MAJORITY OF ITS ASSETS IN COMPANIES THAT EXPLORE FOR, EXTRACT,  PROCESS
OR DEAL IN GOLD OR IN  ASSET-RELATED  SECURITIES  INDEXED  TO THE  VALUE OF SOME
NATURAL  RESOURCE  SUCH AS GOLD BULLION.  Such a change in  investment  strategy
could  require  the Fund to  liquidate  portfolio  assets and incur  transaction
costs.  There can be no assurance  that any such change in  investment  strategy
will result in the realization of the Fund's investment objective.

    Except as described below, the Fund under normal circumstances will maintain
at least 65% of its total assets in natural resource  related  investments or in
asset-related securities.

    At times Eaton Vance may judge that  investment  conditions  make the Fund's
basic investment strategies described above inconsistent with the best interests
of  shareholders.  At such  times  Eaton  Vance may use  alternative  investment
strategies  primarily designed to reduce fluctuations in the value of the Fund's
assets. In implementing  these temporary  "defensive"  strategies,  the Fund may
invest in U.S.  Government  securities  and money market  securities,  including
repurchase  agreements,  or  hold a  portion  of its  assets  in  cash  or  cash
equivalents.  The Fund may also  hold a portion  of its  assets in cash or money
market instruments,  including repurchase  agreements and cash equivalents,  for
liquidity purposes.  It is impossible to predict when, or for how long, the Fund
will use these alternative strategies.

NATURAL RESOURCE RELATED INVESTMENTS.  Under normal investment  conditions it is
anticipated  that the Fund's  portfolio  will  include a  significant  amount of
domestic and foreign natural  resource related  investments.  A natural resource
related investment  includes securities issued by companies engaged in exploring
for, developing, processing, fabricating, producing, distributing, dealing in or
owning natural  resources,  companies  engaged in the creation or development of
technologies  for the  production  or use of natural  resources,  and  companies
engaged in the furnishing of technology,  equipment, supplies or services to the
natural resource investment sector.  Eaton Vance currently deems a company to be
in the natural resource investment sector (a) if at least 50% of the non-current
assets, capitalization, gross revenues or operating profit of the company in the
most  recent or current  fiscal year are  involved  in or result  from  (whether
directly or indirectly through affiliates) any of the foregoing  activities,  or
(b) if in Eaton Vance's judgment the company's natural resource assets, revenues
or profit  are of such  magnitude,  when  compared  with the  total  non-current
assets, capitalization,  gross revenues or operating profit of the company, that
favorable  changes in the value of such assets or level of its natural  resource
revenues  or profit  could  favorably  affect  the  market  value of the  equity
securities of the company.

    Natural  resources  include  substances,  materials and energy  derived from
natural sources which have economic value. Examples of natural resources include
precious  metals (e.g.,  gold,  silver and  platinum),  ferrous and  non-ferrous
metals (e.g.,  iron,  aluminum and copper),  strategic  metals (e.g.,  titanium,
chromium,  vanadium and niobium),  energy resources (coal, oil, natural gas, oil
shale and uranium),  timberland,  undeveloped real property and agricultural and
other commodities.

    Eaton Vance will seek to identify securities of companies in this investment
sector which, in its judgment,  are  undervalued  relative to the value of their
natural resource assets, revenues or profits in light of current and anticipated
economic or financial conditions.  Eaton Vance believes that the market value of
securities of companies that have different  kinds of natural  resource  assets,
revenues  or profits may move  relatively  independently  of one another  during
different stages of investment and inflationary  cycles.  Eaton Vance's flexible
investment  approach  enables  it to change the Fund's  investment  emphasis  to
various subsectors within the large natural resource investment sector depending
upon Eaton Vance's  outlook as to  developments  and trends which may affect the
value  of  and  prospects  for  different  types  of  natural  resource  related
investments.

    In reviewing  natural  resource related  investments  available to the Fund,
Eaton  Vance will  consider,  among  other  investments,  domestic  and  foreign
companies which may

    * EXPLORE FOR, FINANCE,  DEVELOP, PRODUCE OR HOLD GOLD, SILVER, PLATINUM AND
      OTHER  PRECIOUS  METALS.  Eaton Vance will give  special  emphasis in this
      subsector to efficiently  managed,  low cost gold producers which are able
      to  operate  profitably  at the  current  level  of gold  prices,  thereby
      benefiting from any future increase in gold prices.

    * EXPLORE FOR,  FINANCE,  DEVELOP OR PRODUCE  ENERGY  RESOURCES SUCH AS OIL,
      NATURAL GAS, COAL, OIL SHALE AND URANIUM.  In this subsector,  Eaton Vance
      will stress low cost  producers  whose  reserves  will allow  expansion of
      production and those companies with  established  earnings records in both
      rising and falling energy markets.

    * EXPLORE FOR,  FINANCE,  DEVELOP, PRODUCE OR HOLD STRATEGIC METALS, SUCH AS
      TITANIUM, CHROMIUM, VANADIUM AND NIOBIUM.

    * CREATE AND DEVELOP NEW GEOCHEMICAL  TECHNOLOGY OR PROPRIETARY  METHODS FOR
      DETECTING,  DEVELOPING, PRODUCING OR PROCESSING MINERAL DEPOSITS AND OTHER
      NATURAL RESOURCES.

    * OWN,  LEASE OR HAVE  RIGHTS TO HOLDINGS  OF TIMBER AND  TIMBERLANDS.  This
      would include those  companies which  manufacture or process pulp,  paper,
      wood products and other specialty products.

    * PROVIDE  NATURAL  RESOURCE  TRANSPORTATION,  DISTRIBUTION  AND  PROCESSING
      SERVICES, SUCH AS PIPELINES AND REFINING.

DIRECT  PLACEMENT  SECURITIES AND VENTURE CAPITAL  INVESTMENTS.  On occasion the
Fund  may  make  natural  resource  related  investments  in  "direct  placement
securities"  issued  by  a  company  directly  to  the  Fund.  Direct  placement
securities are normally not available to small investors,  but are often offered
to institutional  investors such as the Fund.  Various  considerations  may lead
issuers to seek direct placement of their securities.  For example, such issuers
may not be in a position to sell such securities  publicly  because they need to
raise money within a short  period of time or need a relatively  small amount of
money to fund their current operations or a particular project. Such issuers may
desire to establish  relations  with  institutional  investors  such as the Fund
which will have a continuing  financial  interest in the issuer and perhaps make
further investments.  Alternatively, the climate of the public securities market
may be  temporarily  unfavorable  either  in  general  or  with  respect  to the
particular industry or company.  The Fund believes there exist opportunities for
acquiring direct  placement  securities from issuers  (particularly  from junior
North American gold mining  companies) with substantial  growth potential in the
natural resources area.

    Direct  placement  securities  acquired by the Fund will be common stock, or
obligations or preferred stock having, as part of the package purchased,  equity
features such as  accompanying  shares of common stock,  securities  convertible
into such shares, or conversion rights or warrants to purchase such shares.  The
shares of common  stock  which are the  subject  of such  equity  features  will
generally  be the shares of the  issuer,  although in some cases they may be the
shares of a parent or other affiliate of the issuer, and will usually have or be
expected in time to have a public market.  Nearly all securities acquired by the
Fund  directly  from an issuer and shares  into  which  such  securities  may be
converted or which may be purchased on the exercise of warrants  will,  however,
be subject to legal or contractual  delays in or restrictions on resale and will
therefore  initially  be  treated  as  "restricted  securities"  in  the  Fund's
portfolio.

    The Fund is also empowered to make natural resource  related  investments in
"venture capital companies" -- companies, the securities of which have no public
market  at the  time of  investment.  An  investment  of  this  type  gives  the
aggressive  investor  participation  in  a  private  enterprise  which  may,  if
successful, afford significant appreciation potential. Venture capital investing
is by its very  nature a  high-risk  activity  which can  result in  substantial
losses.

    Eaton Vance  anticipates  that the Fund's direct  placement  securities  and
venture  capital  investments  will  constitute  a small  portion  of its  total
portfolio,  and may include  companies  involved in the  production  of precious
metals.   Advances  in  extractive  and   exploration   technology  as  well  as
inflationary  economic  conditions  have  provided  opportunities  for small and
medium sized independent  companies to profitably  exploit previously known gold
orebodies and newly  discovered  types of orebodies.  Eaton Vance  believes that
investing in such companies may produce  superior  investment  returns.  In this
connection, Eaton Vance will attempt to identify those entrepreneurially managed
emerging  companies  which  concentrate  in  developing  mines  that  offer  the
potential of quick payback,  relatively  high rates of return at current prices,
and the possibility of orebody extensions.

    All of such investments will involve risks to the Fund and its shareholders.
Therefore,  the Fund may not invest more than 10% of its total assets,  taken at
market value at the time of investment,  in certain securities issued by venture
capital companies,  certain over-the-counter  options,  unmarketable securities,
and repurchase  agreements maturing in more than seven days. The Fund is further
subject to an additional  investment  restriction (set forth in the Statement of
Additional  Information)  which in effect  prohibits an  investment  which would
cause more than 5% of its total assets, taken at market value, to be invested in
companies with less than three years of continuous operations. The Fund's direct
placement securities and venture capital investments are considered  speculative
in nature and are not readily marketable.

METALS  INVESTMENTS.  In addition to  investments  in natural  resource  related
securities,  the Fund may  invest up to 10% of its  portfolio  in gold or silver
bullion, strategic metals, and gold or silver coins ("Metals Investments").  The
Fund will invest only in metals that are readily  marketable,  and in coins only
if there is an active quoted market for the coins in question. Coins will not be
purchased for their numismatic value.

    In making direct  investments  in bullion or metals,  the Fund normally will
not take  possession of the bullion or metals,  but instead will obtain receipts
or  certificates  representing  ownership.  In the  event  the  Fund  does  take
possession,  the  bullion  or  metals  would  be  delivered  to  and  held  by a
nonaffiliated  sub-custodian in a segregated account.  When it purchases bullion
or  metals,  either  by  purchasing  receipts  or  certificates  or by  having a
sub-custodian physically hold such metals, the Fund will pay for the metals only
upon actual receipt.  Although the Fund would incur storage,  shipping and other
costs by owning bullion or metals,  such costs should be minimized by the use of
receipts or certificates.

    The Fund's Metals  Investments will not generate  income.  The return to the
Fund from its Metals  Investments will consist solely of market  appreciation or
depreciation  and gains or losses realized on sales.  Accordingly,  as indicated
above,  the Fund will not  invest  more than 10% of its total  assets,  taken at
market value at the time of investment, in Metals Investments.

ACTIVE MANAGEMENT  STRATEGIES.  The Fund may engage in various active management
strategies,  including  entering into repurchase  agreements and forward foreign
currency  exchange   contracts,   writing  and  purchasing  options  on  foreign
currencies,  and leverage through borrowing. The Fund may write covered call and
covered  put  options  on  securities  and  metals,  purchase  such call and put
options,  and enter into  closing  purchase and sale  transactions  with respect
thereto. The Fund may, for hedging or permissible non-hedging purposes, purchase
and sell futures  contracts on various  securities and metals and other physical
commodities,  certificates  of deposit,  Eurodollar  time  deposits,  securities
indices,  economic  indices (e.g.,  the Consumer Price Indices and the Commodity
Research Bureau Futures Price Index) and other financial instruments or indices,
purchase  and write call and put options on any of such  futures  contracts  and
enter into closing purchase and sale transactions with respect to such contracts
and options.  Options,  futures  contracts,  forward  contracts  and  repurchase
agreements  involve  credit  and  other  risks  which  are  described  below.  A
discussion  of the  greater  costs and risks  which may  result  from the Fund's
investment  policy with  respect to  leveraging  through  borrowing is set forth
under  "Special  Considerations  --  Leverage  Through  Borrowing".  The  Fund's
investments in Metals Investments and in certain options,  futures contracts and
forward  contracts on foreign  currencies or  commodities  may be limited by tax
requirements for  qualification of the Fund as a regulated  investment  company.
The Fund expects that various new types of investments,  hedging  techniques and
management  strategies  will be developed  and made  available to  institutional
investors in the future.  Eaton Vance will consider  making such  investments or
using such  techniques or strategies if it determines  that they are  consistent
with the Fund's investment objective and policies.


SPECIAL CONSIDERATIONS
------------------------------------------------------------------------------

The  Fund's  classification  under  the  Investment  Company  Act of  1940  as a
"non-diversified"  investment  company  allows it to invest  more than 5% of its
assets in the securities of any issuer and, during certain periods,  to own more
than  10% of the  voting  securities  of an  issuer.  Since  a  relatively  high
percentage  of the  Fund's  assets  may  from  time to time be  invested  in the
securities of a limited  number of issuers which may be in the natural  resource
investment sector, the value of the Fund's shares could be adversely affected by
a single economic,  political or regulatory occurrence or other development.  In
any event,  because  the Fund  expects to  concentrate  its  investments  in the
natural resources sector or various subsectors thereof,  the value of its shares
will be especially  affected by factors  peculiar to this investment  sector and
may  fluctuate  more  widely  than the value of shares  of a mutual  fund  which
invests  in a  broader  range  of  industries.  The  Fund  should  therefore  be
considered as an investment  vehicle in the natural resources sector, and not as
a balanced investment program.

FOREIGN INVESTMENTS.  There are no prescribed  geographic limits on companies in
which the Fund may  invest.  The Fund has no  restrictions  on the amount of its
assets  that may be  invested  in  securities  of foreign  issuers  and thus the
relative amount of such investments will change from time to time. Under certain
economic,  financial and political conditions,  the Fund may invest primarily in
foreign  securities.  Investing in foreign  securities  may  represent a greater
degree of risk than investing in domestic securities, because of the possibility
of exchange rate fluctuations, adoption of adverse exchange control regulations,
delays in settlement of  transactions,  less publicly-  available  financial and
other  information,  more  volatile  and less liquid  markets,  less  securities
regulation,  higher brokerage costs,  difficulties in enforcing judgments,  less
favorable tax provisions,  war,  expropriation or  nationalization  of assets or
other  adverse  governmental  actions.  Since the Fund may invest in  securities
denominated or quoted in currencies other than the United States dollar, changes
in foreign  currency  exchange  rates may affect the value of  securities in the
portfolio and the unrealized appreciation or depreciation of investments insofar
as United States investors are concerned.

    The Fund may invest in securities of foreign  issuers either  directly or in
the form of American Depository Receipts ("ADRs"),  European Depository Receipts
("EDRs") or other  similar  securities  convertible  into  securities of foreign
issuers.  These securities are not necessarily  denominated in the same currency
as the securities into which they may be converted.  ADRs are receipts typically
issued by a U.S.  banking  institution  evidencing  ownership of the  underlying
securities;  EDRs are receipts  evidencing a similar arrangement with a European
banking institution. Generally ADRs, in registered form, are designed for use in
U.S.  securities  markets and EDRs,  in bearer  form,  are  designed  for use in
European  securities  markets.  Such  securities  may or may not be  listed on a
foreign securities exchange.

GOLD-RELATED  INVESTMENTS.  As indicated above, under certain  circumstances the
Fund may  invest a  majority  of its  assets  in  gold-related  companies  or in
asset-related  securities.  Based on  historic  experience,  during  periods  of
economic or political  instability the securities of gold-related  companies may
be subject to wide price  fluctuations,  reflecting the high  volatility of gold
prices  during such periods.  In addition,  the  instability  of gold prices may
result in volatile earnings of gold-related companies which, in turn, may affect
adversely the financial condition of such companies.  Gold mining companies also
are subject to the risks generally associated with mining operations.

    The major  producers of gold include the Republic of South  Africa,  Russia,
Canada,  the United States,  Brazil and  Australia.  Sales of gold by Russia are
largely unpredictable and often relate to political and economic  considerations
rather than to market forces. Economic, social and political developments within
South Africa may affect significantly South African gold production.

    The Fund does not  intend to invest  in  companies  the  assets of which are
located primarily in the Republic of South Africa.  This current  limitation may
affect  adversely the Fund's  ability to invest in  gold-related  securities and
during certain  periods may result in the Fund  restricting  its  investments to
relatively few gold-related companies.

ASSET-RELATED  SECURITIES.  The Fund may  invest in debt  securities,  preferred
stocks or convertible  securities,  the principal  amount,  redemption  terms or
conversion  terms of which  are  related  to the  market  price of some  natural
resource asset such as gold bullion.  For the purposes of the Fund's  investment
policies, these securities are referred to as "asset-related securities".  While
the market prices for an asset-related security and the related natural resource
asset  generally  are expected to move in the same  direction,  there may not be
perfect correlation in the two price movements. Asset-related securities may not
necessarily  be  secured by a security  interest  in or claim on the  underlying
natural  resource  asset.  The  asset-related  securities  in which the Fund may
invest may bear  interest or pay  preferred  dividends  at below market (or even
relatively  nominal)  rates.  As an example,  assume gold is selling at a market
price of $300 per ounce and an issuer  sells a $1,000 face  amount gold  related
note with a seven year  maturity,  payable at  maturity at the greater of either
$1,000 in cash or the then market price of three ounces of gold. If at maturity,
the market price of gold is $400 per ounce, the amount payable on the note would
be $1,200.  Certain asset-related  securities may be payable at maturity in cash
at the stated  principal  amount or, at the option of the holder,  directly in a
stated amount of the asset to which it is relate.  In such instance the Fund may
sell the  asset-related  security  in the  secondary  market,  to the extent one
exists, prior to maturity if the value of the stated amount of the asset exceeds
the  stated  principal  amount  and  thereby  realize  the  appreciation  in the
underlying asset.

CERTAIN  INVESTMENT  RESTRICTIONS  AND  POLICIES.  The Fund has adopted  certain
fundamental investment  restrictions and policies which are enumerated in detail
in the Statement of Additional  Information  and which may not be changed unless
authorized by a shareholder vote. Briefly, among these fundamental restrictions,
the Fund may not (1) pledge more than 33 1/3% of its total  assets to secure its
permitted borrowings; (2) purchase more than 10% of the total outstanding voting
securities  of  an  issuer,  except  when  significant  economic,  political  or
financial  instability is anticipated;  or (3) invest more than 10% of its total
assets in venture capital companies, unmarketable securities, options on foreign
currencies which do not trade on exchanges and repurchase agreements maturing in
more  than  seven  days.  These  restrictions  are  considered  at the  time  of
acquisition of assets; the sale of portfolio assets is not required in the event
of a subsequent  change in  cirumstances.  In  addition,  the Fund has adopted a
fundamental  policy  which  requires  it  during  normal  market  conditions  to
concentrate  at least 25% of its total assets in the natural  resource  group of
industries.  Except for the  fundamental  investment  restrictions  and policies
specifically  enumerated  in  the  Statement  of  Additional  Information,   the
investment  objective and policies of the Fund are not fundamental  policies and
accordingly may be changed by the Trustees without obtaining the approval of the
Fund's shareholders.  While not required to do so, the Trustees intend to submit
any material change in the Fund's  investment  objective to the shareholders for
their approval.

    Eaton  Vance  intends  to follow  certain  other  nonfundamental  investment
policies (which may be changed without  shareholder  authorization)  in managing
the Fund's portfolio in addition to the other nonfundamental investment policies
described or referred to elsewhere in this  Prospectus.  These policies may help
to reduce  investment  risk. It is the Fund's  current policy not to invest more
than 10% of its total assets in the securities of any one issuer (excluding U.S.
Government securities,  or certificates of deposit, bankers' acceptances or time
deposits  of banking or thrift  institutions),  or to invest more than 5% of its
assets  in  warrants  (excluding  warrants  acquired  in  units or  attached  to
securities, which warrants are deemed to be without value).

    The Fund  intends to qualify as a  regulated  investment  company  under the
Internal Revenue Code (the "Code") and consequently  will not be required to pay
any  Federal  income or excise  taxes to the extent that it  distributes  to its
shareholders  its net  investment  income and net realized  capital gains in the
manner  required by the Code. The Code  currently  requires that the Fund, to so
qualify,  among other  things,  at the close of each of its fiscal  quarters and
with  respect to 50% of its  assets,  (i) may not have more than 5% of its total
assets  invested in the securities of any one issuer (except  obligations of the
U.S. Government,  its agencies or  instrumentalities)  and (ii) may not own more
than 10% of the  outstanding  voting  securities  of any one issuer.  These Code
diversification requirements could affect the Fund's portfolio investments under
certain conditions.

PORTFOLIO TURNOVER.  Eaton Vance will change the Fund's investments  whenever it
believes a change may be  appropriate,  without  regard to how long a particular
investment may have been held. Changes in investments generally involve expenses
to the Fund,  which may include  brokerage  commissions  or dealer  mark-ups and
other  transaction  costs on the disposition of investments and  reinvestment of
the  proceeds  in  other  investments,  and  may  result  in net  capital  gains
distributions  of which will be subject to tax. The Fund's  investment  policies
and  strategies  may  result  in a higher  portfolio  turnover  rate  than  that
experienced by other mutual funds. The Fund's  portfolio  turnover rate will not
be a  limiting  factor  when  Eaton  Vance  considers  a  change  in the  Fund's
investment portfolio, and in any fiscal year such rate could exceed 200%.

REPURCHASE  AGREEMENTS.  The Fund may  enter  into  repurchase  agreements  with
respect to its permitted  investments,  but currently intends to do so only with
member  banks of the  Federal  Reserve  System or with  primary  dealers in U.S.
Government securities.  Under a repurchase agreement the Fund buys a security at
one price and  simultaneously  promises to sell that same  security  back to the
seller at a higher price.  The  repurchase  date is usually within seven days of
the original purchase date. At no time will the Fund commit more than 10% of its
assets to repurchase agreements which mature in more than seven days. Repurchase
agreements are deemed to be loans under the  Investment  Company Act of 1940. In
all cases Eaton Vance must be satisfied with the  creditworthiness  of the other
party to the agreement before entering into a repurchase agreement. In the event
of the bankruptcy of the other party to a repurchase  agreement,  the Fund might
experience  delays in recovering  its cash. To the extent that, in the meantime,
the value of the  securities  the Fund  purchased may have  decreased,  the Fund
could experience a loss.

LEVERAGE THROUGH  BORROWING.  The Fund may borrow from banks or by entering into
reverse repurchase  agreements to increase its portfolio holdings of securities,
commodities  and commodity  contracts.  Such  borrowings  may be on a secured or
unsecured  basis at fixed or variable  rates of interest.  A reverse  repurchase
agreement is functionally  identical to a repurchase  agreement  except that the
roles of the parties are reversed so that the Fund will sell the the  underlying
security  with the promise to  repurchase.  The  Investment  Company Act of 1940
requires the Fund to maintain  continuous  asset  coverage of not less than 300%
with respect to all borrowings. This allows the Fund to borrow for such purposes
an amount (when taken  together with any  borrowings  for temporary or emergency
purposes  as  described  below)  equal to as much as 50% of the value of its net
assets (not including such borrowings). If such asset coverage should decline to
less than  300% due to market  fluctuations  or other  reasons,  the Fund may be
required to dispose of some of its portfolio holdings within three days in order
to reduce the Fund's debt and restore  the 300% asset  coverage,  even though it
may be  disadvantageous  from an  investment  standpoint to dispose of assets at
that time.  Leveraging will exaggerate any increase or decrease in the net asset
value  of the  Fund's  portfolio,  and in  that  respect  may  be  considered  a
speculative  practice.  The interest which the Fund must pay on borrowed  money,
together  with any  additional  fees to maintain a line of credit or any minimum
average  balances  required to be maintained by the bank, are  additional  costs
which will reduce or eliminate any net investment income and may also offset any
potential  capital gains.  Unless the appreciation and income, if any, on assets
acquired with borrowed funds exceed the costs of borrowing,  the use of leverage
will diminish the investment performance of the Fund compared with what it would
have been without leverage.

    The Fund will not always borrow money for additional investments. The Fund's
willingness to borrow money, and the amount it will borrow,  will depend on many
factors the most important of which are market  conditions  and interest  rates.
Successful  use of a leveraging  strategy  depends on Eaton  Vance's  ability to
correctly predict interest rates and market movements.

    The Fund, like many other  investment  companies,  may also borrow money for
temporary or emergency  purposes,  but such borrowings may not exceed 10% of the
value of the Fund's gross assets when the loan is made.

DERIVATIVE  INSTRUMENTS.  From time to time, the Fund may purchase or enter into
derivative  instruments  to enhance  return,  to hedge against  fluctuations  in
securities  prices or currency  exchange  rates,  to change the  duration of the
Fund's fixed income  portfolio  (if any) or as a substitute  for the purchase or
sale of securities or currency.  The Fund's investments in derivative securities
may include indexed securities.  The Fund's transactions in derivative contracts
may include the purchase or sale of futures contracts on securities,  indices or
currency;  options  on futures  contracts;  options  on  securities,  indices or
currency; and forward contracts to purchase or sell securities or currency.

    All of the Fund's  transactions in derivative  instruments involve a risk of
loss or  depreciation  due to  unanticipated  adverse changes in interest rates,
securities prices or currency  exchange rates. The loss on derivative  contracts
(other than purchase options) may exceed the Fund's initial  investment in these
contracts.  In addition, the Fund may lose the entire premium paid for purchased
options that expire before they can be profitably exercised by the Fund.

    Indexed  Securities.  The Fund may invest in indexed  securities,  including
PERLs and other currency linked securities. The interest rate or, in some cases,
the  principal  payable  at the  maturity  of an  indexed  security  may  change
positively  or inversely in relation to one or more  interest  rates,  financial
indices,  currency rates or other financial indicators  ("reference prices"). An
indexed security may be leveraged to the extent that the magnitude of any change
in the interest rate or principal  payable on an indexed  security is a multiple
of the change in the reference price.  Thus,  indexed  securities may decline in
value  due to  adverse  market  changes  in  currency  exchange  rates and other
reference prices.

    Derivative Contracts. The Fund may purchase and sell a variety of derivative
contracts,  including  futures  contracts  on  securities,  indices or currency;
options  on  futures  contracts;  options on  securities,  indices or  currency;
forward  contracts  to purchase or sell  securities  or  currency;  and currency
swaps.   The  Fund  incurs  liability  to  a  counterparty  in  connection  with
transactions in futures  contracts,  forward  contracts and swaps and in selling
options.  The Fund pays a premium for purchased options.  In addition,  the Fund
incurs  transactions  costs in  opening  and  closing  positions  in  derivative
contracts.

    Risks  Associated  With  Derivative  Securities  and  Contracts.  The  risks
associated with the Fund's  transactions in derivative  securities and contracts
may include  some or all of the  following:  (1) market  risk;  (2) leverage and
volatility  risk; (3)  correlation  risk; (4) credit risk; and (5) liquidity and
valuation risk.

    Entering  into a  derivative  contract  involves a risk that the  applicable
market  will move  against  the Fund's  position  and that the Fund will incur a
loss.  For derivative  contracts  other than  purchased  options,  this loss may
exceed the amount of the initial  investment made or the premium received by the
Fund.

    Derivative  instruments  may  sometimes  increase  or  leverage  the  Fund's
exposure to a particular market risk.  Leverage enhances the price volatility of
derivative  instruments  held by the Fund.  The Fund may  partially  offset  the
leverage  inherent in derivative  contracts by maintaining a segregated  account
consisting of cash and liquid, high grade debt securities, by holding offsetting
portfolio securities or currency positions or by covering written options.

    The Fund's success in using derivative instruments to hedge portfolio assets
depends on the degree of price correlation between the derivative instrument and
the  hedged  asset.  Imperfect  correlation  may be caused by  several  factors,
including  temporary  price  disparities  among  the  trading  markets  for  the
derivative  instrument,  the assets underlying the derivative instrument and the
Fund's assets.

    Derivative  securities and  over-the-counter  derivative contracts involve a
risk  that the  issuer or  counterparty  will fail to  perform  its  contractual
obligations.

    Some derivative securities are not readily marketable or may become illiquid
under adverse market conditions.  In addition,  during periods of extreme market
volatility,  a  commodity  or  exchange  may  suspend  or  limit  trading  in an
exchange-traded  derivative  contract,  which may make the contract  temporarily
illiquid  and  difficult  to price.  The staff of the  Securities  and  Exchange
Commission ("SEC") takes the position that certain  over-the-counter options are
illiquid   investments.   The  Fund's  ability  to  terminate   over-the-counter
derivative contracts may depend on the cooperation of the counterparties to such
contracts.  For thinly traded  derivative  securities  and  contracts,  the only
source of price quotations may be the selling dealer or counterparty.

ORGANIZATION OF THE FUND
------------------------------------------------------------------------------

EV MARATHON GOLD & NATURAL  RESOURCES FUND, A BUSINESS TRUST  ESTABLISHED  UNDER
MASSACHUSETTS  LAW PURSUANT TO A  DECLARATION  OF TRUST DATED AUGUST 3, 1987, AS
AMENDED, IS A MUTUAL FUND -- AN OPEN-END  NON-DIVERSIFIED  MANAGEMENT INVESTMENT
COMPANY.  The Fund changed its name from Eaton Vance Natural  Resources Trust to
EV Marathon Gold & Natural  Resources Fund on April 1, 1994. The Trustees of the
Fund are responsible for the overall  management and supervision of its affairs.
The Fund has one class of shares of beneficial interest,  an unlimited number of
which may be issued.  Each share  represents an equal  proportionate  beneficial
interest in the Fund. When issued and outstanding, the shares are fully paid and
nonassessable  by the Fund and redeemable as described under "How to Redeem Fund
Shares".  Shareholders  are  entitled  to one  vote for each  full  share  held.
Fractional  shares may be voted  proportionately.  Shares have no  preemptive or
conversion  rights and are freely  transferable.  Upon  liquidation of the Fund,
shareholders  are  entitled  to  share  pro rata in the net  assets  of the Fund
available for distribution to shareholders.

MANAGEMENT OF THE FUND
------------------------------------------------------------------------------

THE FUND  ENGAGES  EATON  VANCE  MANAGEMENT  ("EATON  VANCE") AS ITS  INVESTMENT
ADVISER.  EATON VANCE,  ITS AFFILIATES AND ITS  PREDECESSOR  COMPANIES HAVE BEEN
MANAGING  ASSETS  OF  INDIVIDUALS  AND  INSTITUTIONS  SINCE  1924  AND  MANAGING
INVESTMENT COMPANIES SINCE 1931.

    Acting  under the general  supervision  of the  Trustees of the Fund,  Eaton
Vance manages the Fund's investments and affairs.  Under its investment advisory
agreement with the Fund,  Eaton Vance receives a monthly  advisory fee of .0625%
(equivalent  to .75 of 1% annually) of the average  daily net assets of the Fund
up to $500  million;  the fee will be reduced at various  asset levels over $500
million.  This  fee may be  higher  than  that  paid by  many  other  investment
companies.

    For the fiscal  year ended  September  30,  1994,  the Fund paid Eaton Vance
advisory fees  equivalent to 0.75%,  of the Fund's  average daily net assets for
such period.

    Eaton  Vance also  furnishes  for the use of the Fund  office  space and all
necessary  office   facilities,   equipment  and  personnel  for  servicing  the
investments of the Fund. The Fund is responsible for the payment of all expenses
other  than  those  expressly  stated to be  payable  by Eaton  Vance  under the
investment advisory agreement.

    Eaton Vance places the Fund's portfolio security  transactions for execution
with many  broker-dealer  firms and uses its best efforts to obtain execution of
such transactions at prices which are advantageous to the Fund and at reasonably
competitive commission rates. Subject to the foregoing, Eaton Vance may consider
sales of shares of the Fund or of other investment  companies sponsored by Eaton
Vance as a factor in the selection of firms to execute portfolio transactions.

    Thomas E. Faust, Jr. has acted as the portfolio manager since 1987. He has
been a Vice President of Eaton Vance since 1985.

EATON VANCE OR ITS AFFILIATES ACTS AS INVESTMENT ADVISER TO INVESTMENT COMPANIES
AND VARIOUS INDIVIDUAL AND INSTITUTIONAL CLIENTS WITH ASSETS UNDER MANAGEMENT OF
APPROXIMATELY  $15 BILLION.  Eaton Vance is a  wholly-owned  subsidiary of Eaton
Vance Corp.,  a publicly held holding  company.  Eaton Vance Corp.,  through its
subsidiaries  and  affiliates,  engages in investment  management  and marketing
activities,  fiduciary and banking services, oil and gas operations, real estate
investment,  consulting,  and  management,  and  development of precious  metals
properties.  Eaton Vance  Distributors,  Inc. (the  "Principal  Underwriter"  or
"EVD"), 24 Federal Street, Boston, MA 02110, a wholly-owned  subsidiary of Eaton
Vance, acts as Principal Underwriter to the Fund.

DISTRIBUTION PLAN
------------------------------------------------------------------------------

THE FUND FINANCES  DISTRIBUTION  ACTIVITIES AND HAS ADOPTED A DISTRIBUTION  PLAN
(THE "PLAN")  PURSUANT TO RULE 12B-1 UNDER THE  INVESTMENT  COMPANY ACT OF 1940.
Rule 12b-1  permits a mutual  fund,  such as the Fund,  to finance  distribution
activities  and bear expenses  associated  with the  distribution  of its shares
provided  that any payments made by the Fund are made pursuant to a written plan
adopted in accordance  with the Rule.  The Plan is also subject to, and complies
with, the sales charge rule of the National  Association of Securities  Dealers,
Inc.  (the "NASD  Rule").  The Plan is described in the  Statement of Additional
Information, and the following is a brief description of the salient features of
the Plan.  The Plan provides that the Fund,  subject to the NASD Rule,  will pay
sales commissions and distribution fees to the Principal  Underwriter only after
and as a result of the sale of shares of the Fund.  On each sale of Fund  shares
(excluding  reinvestment  of  distributions)  the Fund  will  pay the  Principal
Underwriter amounts representing (i) sales commissions equal to 5% of the amount
received by the Fund for each share sold and (ii)  distribution  fees calculated
by applying the rate of 1% over the prime rate then  reported in The Wall Street
Journal  to the  outstanding  balance  of  Uncovered  Distribution  Charges  (as
described  below)  of  the  Principal  Underwriter.  The  Principal  Underwriter
currently expects to pay sales commissions (except on exchange  transactions and
reinvestments) to a financial  services firm (an "Authorized  Firm") at the time
of sale equal to 4% of the purchase  price of the shares sold by such Firm.  The
Principal  Underwriter will use its own funds (which may be borrowed from banks)
to pay such  commissions.  Because  the  payment  of the sales  commissions  and
distribution  fees to the  Principal  Underwriter  is  subject  to the NASD Rule
described  below,  it will take the  Principal  Underwriter a number of years to
recoup the sales  commissions  paid by it to Authorized  Firms from the payments
received by it from the Fund pursuant to the Plan.

    THE NASD  RULE  REQUIRES  THE FUND TO LIMIT  ITS  ANNUAL  PAYMENTS  OF SALES
COMMISSIONS AND DISTRIBUTION FEES TO THE PRINCIPAL  UNDERWRITER TO AN AMOUNT NOT
EXCEEDING  .75% OF THE FUND'S  AVERAGE  DAILY NET ASSETS FOR EACH  FISCAL  YEAR.
Accordingly,  the Fund  accrues  daily an amount at the rate of 1/365 of .75% of
the Fund's net assets,  and pays such accrued  amounts  monthly to the Principal
Underwriter.  The Plan requires such accruals to be  automatically  discontinued
during  any  period in which  there are no  outstanding  Uncovered  Distribution
Charges under the Plan. Uncovered Distribution Charges are calculated daily and,
briefly, are equivalent to all unpaid sales commissions and distribution fees to
which the Principal  Underwriter  is entitled under the Plan less all contingent
deferred sales charges theretofore paid to the Principal Underwriter.  The Eaton
Vance organization may be considered to have realized a profit under the Plan if
at any point in time the  aggregate  amounts  of all  payments  received  by the
Principal  Underwriter  from  the  Fund  pursuant  to the  Plan,  including  any
contingent deferred sales charges,  have exceeded the total expenses theretofore
incurred by such organization in distributing shares of the Fund. Total expenses
for this purpose will include an allocable portion of the overhead costs of such
organization and its branch offices.

    The amount  payable to the Principal  Underwriter  pursuant to the Plan with
respect to each day will be accrued on such day as a  liability  of the Fund and
will  accordingly  reduce  the  Fund's  net  assets  upon such  accrual,  all in
accordance with generally accepted accounting principles.  The amount payable on
each day is limited  to 1/365 of .75% of the Fund's net assets on such day.  The
level of the Fund's net assets  changes  each day and depends upon the amount of
sales  and  redemptions  of  Fund  shares,  the  changes  in  the  value  of the
investments  held by the Fund,  the  expenses  of the Fund  accrued on such day,
income  on  portfolio  investments  of the Fund  accrued  on such  day,  and any
dividends  and  distributions  declared  by the Fund.  The Fund does not  accrue
possible future payments as a liability of the Fund or reduce the Fund's current
net assets in respect of unknown amounts which may become payable under the Plan
in the future  because  the  standards  for  accrual of a  liability  under such
accounting principles have not been satisfied.

    The Plan provides that the Fund will receive all  contingent  deferred sales
charges and will make no payments to the Principal Underwriter in respect of any
day on which  there are no  outstanding  Uncovered  Distribution  Charges of the
Principal  Underwriter.  Contingent  deferred sales charges and accrued  amounts
will  be  paid to the  Principal  Underwriter  whenever  there  exist  Uncovered
Distribution Charges under the Plan.

    The  provisions  of the Plan relating to payments of sales  commissions  and
distribution  fees  to  the  Principal  Underwriter  are  also  included  in the
Distribution Agreement between the Fund and the Principal Underwriter.  The Plan
continues in effect through and including  April 28, 1995, and shall continue in
effect  indefinitely  thereafter for so long as such  continuance is approved at
least  annually by the vote of both a majority  of (i) the  Trustees of the Fund
who are not  interested  persons of the Fund and who have no direct or  indirect
financial interest in the operation of the Plan or any agreements related to the
Plan (the "Rule 12b-1  Trustees")  and (ii) all of the Trustees  then in office,
and the  Distribution  Agreement  contains  a  similar  provision.  The Plan and
Distribution  Agreement  may be  terminated at any time by vote of a majority of
the Rule 12b-1  Trustees  or by a vote of a majority of the  outstanding  voting
securities of the Fund.

    Periods with a high level of sales of Fund shares accompanied by a low level
of early  redemptions  of Fund shares  resulting in the imposition of contingent
deferred  sales  charges  will tend to increase the time during which there will
exist Uncovered Distribution Charges of the Principal  Underwriter.  Conversely,
periods with a low level of sales of Fund shares  accompanied by a high level of
early  redemptions  of Fund shares  resulting in the  imposition  of  contingent
deferred  sales  charges  will tend to reduce the time  during  which there will
exist Uncovered Distribution Charges of the Principal Underwriter.

    Because of the NASD Rule  limitation on the amount of sales  commissions and
distribution  fees paid to the Principal  Underwriter  during any fiscal year, a
high  level of sales of Fund  shares  during  the  initial  years of the  Fund's
operations would cause a large portion of the sales commissions  attributable to
a sale of Fund  shares  to be  accrued  and  paid by the  Fund to the  Principal
Underwriter  in fiscal  years  subsequent  to the year in which such shares were
sold.  This  spreading  of sales  commissions  payments  under  the Plan over an
extended  period  would  result  in the  incurrence  and  payment  of  increased
distribution fees under the Plan.

    For  the  fiscal  year  ended  September  30,  1994,  the  Fund  paid  sales
commissions under the Plan equivalent to .75% (annualized) of the Fund's average
daily  net  assets.   As  of  September  30,  1994  the  outstanding   Uncovered
Distribution  Charges of the  Principal  Underwriter  calculated  under the Plan
amounted to approximately, $435,762 (which amount was equivalent to 3.34% of the
Fund's net assets on such day).

    THE PLAN ALSO  AUTHORIZES  THE FUND TO MAKE  PAYMENTS OF SERVICE FEES TO THE
PRINCIPAL  UNDERWRITER,  AUTHORIZED  FIRMS  AND OTHER  PERSONS  IN  AMOUNTS  NOT
EXCEEDING  .25% OF THE FUND'S AVERAGE DAILY NET ASSETS FOR EACH FISCAL YEAR. The
Trustees of the Fund have  initially  implemented  this provision of the Plan by
authorizing the Fund to make quarterly payments of service fees to the Principal
Underwriter  and Authorized  Firms in amounts not expected to exceed .25% of the
Fund's  average  daily net assets for any fiscal year based on the value of Fund
shares  sold by such  persons  and  remaining  outstanding  for at least  twelve
months.  As  permitted  by the NASD Rule,  such  payments  are made for personal
services  and/or the  maintenance  of  shareholder  accounts.  Service  fees are
separate and distinct from the sales  commissions and distribution  fees payable
by the  Fund to the  Principal  Underwriter,  and as such  are  not  subject  to
automatic  discontinuance when there are no outstanding  Uncovered  Distribution
Charges of the Principal  Underwriter.  For the fiscal year ended  September 30,
1994,  the Fund made  service fee  payments  to the  Principal  Underwriter  and
Authorized  Firms equivalent to 0.08% of the Fund's average daily net assets for
such year.

    The Plan as currently  implemented  by the Trustees  authorizes  payments of
sales commissions and distribution fees to the Principal Underwriter and service
fees to the Principal  Underwriter and Authorized Firms which may be equivalent,
on an aggregate  basis  during any fiscal year of the Fund,  to 1% of the Fund's
average daily net assets for such year. The Fund believes that the combined rate
of all  these  payments  may be  higher  than the rate of  payments  made  under
distribution plans adopted by other investment companies pursuant to Rule 12b-1.
It is anticipated that the Eaton Vance organization will profit by reason of the
operation of the Plan through increases in the Fund's assets (thereby increasing
the advisory fees payable to Eaton Vance) resulting from sale of Fund shares and
through amounts paid under the Plan to the Principal  Underwriter and contingent
deferred sales charges paid to the Principal Underwriter.

    The  Principal  Underwriter  may,  from  time to time,  at its own  expense,
provide  additional  incentives  to  Authorized  Firms which  employ  registered
representatives  who sell a minimum  dollar  amount of the Fund's  shares and/or
shares  of  other  funds  distributed  by the  Principal  Underwriter.  In  some
instances,  such additional incentives may be offered only to certain Authorized
Firms whose  representatives are expected to sell significant amounts of shares.
In  addition,  the  Principal  Underwriter  may from  time to time  increase  or
decrease the sales commissions payable to Authorized Firms.

    The Fund may, in its absolute discretion,  suspend, discontinue or limit the
offering  of its shares at any time.  In  determining  whether  any such  action
should be taken, the Fund's management intends to consider all relevant factors,
including  without  limitation the size of the Fund, the investment  climate and
market  conditions,  the volume of sales and redemptions of Fund shares, and the
amount of Uncovered Distribution Charges of the Principal Underwriter.  The Plan
may  continue in effect and payments  may be made under the Plan  following  any
such  suspension,  discontinuance  or limitation of the offering of Fund shares;
however,  the Fund is not  contractually  obligated to continue the Plan for any
particular period of time.  Suspension of the offering of Fund shares would not,
of course, affect a shareholder's ability to redeem shares.

VALUING FUND SHARES
------------------------------------------------------------------------------

THE FUND  VALUES ITS SHARES  ONCE ON EACH DAY THE NEW YORK STOCK  EXCHANGE  (THE
"EXCHANGE")  IS OPEN FOR  TRADING,  as of the close of  regular  trading  on the
Exchange  (normally  4:00 p.m.  New York  time).  The Fund's net asset value per
share is determined by its custodian,  Investors  Bank & Trust Company  ("IBT"),
(as agent for the Fund) in the manner  authorized  by the  Trustees of the Fund.
Net asset value is computed by dividing  the value of the Fund's  total  assets,
less its  liabilities,  by the number of shares  outstanding.  The Trustees have
established procedures for the valuation of the Fund's assets; in general, these
valuations are based on market value or fair value, with special  provisions for
valuing debt obligations,  short-term investments,  foreign securities,  hedging
instruments,  direct  placement  securities,   investments  in  Venture  Capital
Companies, and assets not having readily available market quotations.

    Authorized  Firms must  communicate  an  investor's  order to the  Principal
Underwriter  prior to the close of the Principal  Underwriter's  business day to
receive  that  day's net asset  value per  share.  It is the  Authorized  Firms'
responsibility to transmit orders promptly to the Principal  Underwriter,  which
is a wholly-owned subsidiary of Eaton Vance. Eaton Vance Corp. owns 77.3% of the
outstanding stock of IBT, the Fund's custodian.

--------------------------------------------------------------------------------
  SHAREHOLDERS  MAY DETERMINE THE VALUE OF THEIR  INVESTMENT BY MULTIPLYING  THE
  NUMBER OF FUND SHARES OWNED BY THE CURRENT NET ASSET VALUE.
------------------------------------------------------------------------------


HOW TO BUY FUND SHARES
------------------------------------------------------------------------------

SHARES OF THE FUND MAY BE PURCHASED  FOR CASH OR MAY BE ACQUIRED IN EXCHANGE FOR
SECURITIES.  Investors may purchase shares of the Fund through  Authorized Firms
at the net asset value per share of the Fund next  determined  after an order is
effective.  The Fund may  suspend  the  offering  of  shares at any time and may
refuse an order for the purchase of shares.

    An initial  investment in the Fund must be at least $1,000.  Once an account
has been  established  the investor may send  investments  of $50 or more at any
time directly to the Fund's  Transfer Agent (the  "Transfer  Agent") as follows:
The Shareholder  Services Group, Inc., BOS725,  P.O. Box 1559, Boston, MA 02104.
The  $1,000  minimum  initial  investment  is waived  for Bank  Draft  Investing
accounts, which may be established with an investment of $50 or more. See "Eaton
Vance Shareholder Services".

    In connection with employee benefit or other continuous group purchase plans
under which the average initial  purchase by a participant of the plan is $1,000
or more, the Fund may accept initial investments of less than $1,000 on the part
of an individual participant. In the event a shareholder who is a participant of
such a plan terminates his or her  participation in the plan, the shares will be
transferred  to a regular  individual  account.  However,  such  account will be
subject to the right of redemption by the Fund as described  below under "How to
Redeem Fund Shares."

     ACQUIRING  FUND SHARES IN EXCHANGE FOR  SECURITIES.  IBT, as escrow  agent,
will receive  securities  acceptable to Eaton Vance, as investment  adviser,  in
exchange  for Fund  shares at their net asset  value as  determined  above.  The
minimum  value of  securities  or  securities  and cash  accepted for deposit is
$5,000.  Securities  accepted  will be sold by IBT as agent for the  account  of
their  owner  on the  day of  their  receipt  by IBT or as  soon  thereafter  as
possible. The number of Fund shares to be issued in exchange for securities will
be the  aggregate  proceeds  from the sale of such  securities,  divided  by the
applicable net asset value per Fund share on the day such proceeds are received.
Eaton Vance will use  reasonable  efforts to obtain the current market price for
such  securities  but does not guarantee the best price  available.  Eaton Vance
will  absorb any  transaction  costs,  such as  commissions,  on the sale of the
securities.

    Securities  determined to be acceptable should be transferred via book entry
or  physically  delivered,  in proper form for  transfer,  through an Authorized
Firm,  together with a completed and signed  Letter of  Transmittal  in approved
form (available from Authorized Firms), as follows:

     IN THE CASE OF BOOK ENTRY:
          Deliver through Depository Trust Co.
          Broker #2212
          Investors Bank & Trust Company
          For A/C EV  Marathon  Gold &  Natural  Resources  Fund

     IN THE  CASE OF PHYSICAL DELIVERY:
          Investors Bank & Trust Company
          Attention: EV Marathon Gold & Natural Resources Fund
          Physical Securities Processing Settlement Area
          89 South Street
          Boston, MA 02111

    Investors who are  contemplating an exchange of securities for shares of the
Fund, or their  representatives,  must contact Eaton Vance to determine  whether
the securities are acceptable  before  forwarding  such securities to IBT. Eaton
Vance  reserves the right to reject any  securities.  Exchanging  securities for
Fund shares may create a taxable gain or loss.  Each investor should consult his
or her tax adviser with respect to the particular  Federal,  state and local tax
consequences of exchanging securities for Fund shares.

--------------------------------------------------------------------------------
  IF YOU DON'T HAVE AN AUTHORIZED FIRM, EATON VANCE CAN RECOMMEND ONE.
------------------------------------------------------------------------------

HOW TO REDEEM FUND SHARES
------------------------------------------------------------------------------

A SHAREHOLDER MAY REDEEM FUND SHARES BY DELIVERING TO THE  SHAREHOLDER  SERVICES
GROUP, INC.,  BOS725,  P.O. BOX 1559, BOSTON,  MASSACHUSETTS  02104,  during its
business hours a written  request for  redemption in good order,  plus any share
certificates  with executed stock powers.  The redemption price will be based on
the net asset  value per share next  computed  after such  delivery.  Good order
means that all  relevant  documents  must be  endorsed  by the  record  owner(s)
exactly as the shares are registered and the signature(s)  must be guaranteed by
a member of either the Securities  Transfer  Association's  STAMP program or the
New York Stock Exchange's Medallion Signature Program, or certain banks, savings
and loan institutions,  credit unions, securities dealers, securities exchanges,
clearing  agencies  and  registered  securities  associations  as  required by a
regulation of the  Securities and Exchange  Commission  (the  "Commission")  and
acceptable to The Shareholder  Services Group, Inc. In addition,  in some cases,
good order may require the  furnishing  of  additional  documents  such as where
shares are registered in the name of a corporation, partnership or fiduciary.

    Within seven days after receipt of a redemption request in good order by The
Shareholder Services Group, Inc., the Fund will make payment in cash for the net
asset value of the shares as of the date determined above, reduced by the amount
of any applicable  contingent deferred sales charges described below and Federal
income tax required to be withheld.

    To sell  shares at their net  asset  value  through  an  Authorized  Firm (a
repurchase),  a  shareholder  can place a repurchase  order with the  Authorized
Firm,  which may  charge a fee.  The value of such  shares is based upon the net
asset value calculated after EVD, as the Fund's agent, receives the order. It is
the Authorized Firm's  responsibility to transmit promptly  repurchase orders to
EVD.  Throughout this  Prospectus,  the word  "redemption" is generally meant to
include a repurchase.

    If  shares  were  recently   purchased,   the  proceeds  of  redemption  (or
repurchase) will not be sent until the check (including a certified or cashier's
check)  received  for the  shares  purchased  has  cleared.  Payment  for shares
tendered for redemption may be delayed up to 15 days from the purchase date when
the purchase check has not yet cleared. Redemptions or repurchases may result in
a taxable gain or loss.

    Due to the high cost of maintaining  small  accounts,  the Fund reserves the
right to redeem Fund accounts with balances of less than $1,000. Prior to such a
redemption,  shareholders  will be  given  60  days  written  notice  to make an
additional  purchase.  Thus, an investor making an initial  investment of $1,000
would  not be able to  redeem  shares  without  being  subject  to this  policy.
However,  no such  redemption  would be required by the Fund if the cause of the
low account  balance was a reduction in the net asset value of Fund  shares.  No
contingent   deferred  sales  charge  will  be  imposed  with  respect  to  such
involuntary redemptions.

    CONTINGENT DEFERRED SALES CHARGE. Shares redeemed within the first six years
of  their  purchase   (except  shares  acquired   through  the  reinvestment  of
distributions)  generally will be subject to a contingent deferred sales charge.
This contingent deferred sales charge is imposed on any redemption the amount of
which exceeds the aggregate value at the time of redemption of (a) all shares in
the  account  purchased  more than six years  prior to the  redemption,  (b) all
shares in the account acquired through  reinvestment of  distributions,  and (c)
the increase,  if any, of value of all other shares in the account (namely those
purchased within the six years preceding the redemption) over the purchase price
of such shares.  Redemptions are processed in a manner to maximize the amount of
redemption  proceeds  which will not be subject to a contingent  deferred  sales
charge;  i.e.,  each redemption will be assumed to have been made first from the
exempt amounts referred to in clauses (a), (b) and (c) above, and second through
liquidation  of those  shares in the  account  referred  to in  clause  (c) on a
first-in-first-out basis. Any contingent deferred sales charge which is required
to be imposed on share redemptions will be made in accordance with the following
schedule:

             YEAR OF                                            CONTINGENT
           REDEMPTION                                         DEFERRED SALES
         AFTER PURCHASE                                           CHARGE
         --------------                                       --------------
      First ..............................................          5%
      Second .............................................          5%
      Third ..............................................          4%
      Fourth .............................................          3%
      Fifth ..............................................          2%
      Sixth ..............................................          1%
      Seventh and following ..............................          0%

    For shares purchased prior to August 1, 1994, the contingent  deferred sales
charge  for  redemptions  within  the  first  year  after  purchase  is  6%.  In
calculating  the  contingent  deferred  sales charge upon the redemption of Fund
shares acquired in an exchange for shares of a fund currently  listed under "The
Eaton Vance Exchange  Privilege",  the contingent deferred sales charge schedule
applicable  to the shares at the time of purchase will apply and the purchase of
Fund shares  acquired in the exchange is deemed to have  occurred at the time of
the original purchase of exchanged shares. The contingent  deferred sales charge
will be waived for shares redeemed (1) pursuant to a Withdrawal Plan (see "Eaton
Vance  Shareholder  Services") or (2) as part of a required  distribution from a
tax-sheltered  retirement  plan or (3)  following  the  death of all  beneficial
owners of such shares,  provided the redemption is requested  within one year of
death (a death certificate and other applicable documents may be required).

    No  contingent  deferred  sales charge will be imposed on shares of the Fund
which  have been sold to Eaton  Vance,  its  affiliates  or to their  respective
employees or clients.  The contingent  deferred sales charge will be paid to the
Principal  Underwriter  or the Fund.  When paid to the Principal  Underwriter it
will reduce the amount of Uncovered  Distribution  Charges  calculated under the
Fund's Distribution Plan. See "Distribution Plan."

--------------------------------------------------------------------------------
  THE FOLLOWING  EXAMPLE  ILLUSTRATES  THE OPERATION OF THE CONTINGENT  DEFERRED
  SALES CHARGE.  ASSUME THAT AN INVESTOR  PURCHASES $10,000 OF THE FUND'S SHARES
  AND THAT 16 MONTHS LATER THE VALUE OF THE ACCOUNT HAS GROWN THROUGH INVESTMENT
  PERFORMANCE AND REINVESTMENT OF  DISTRIBUTIONS  TO $12,000.  THE INVESTOR THEN
  MAY REDEEM UP TO $2,000 OF SHARES  WITHOUT  INCURRING  A  CONTINGENT  DEFERRED
  SALES CHARGE.  IF THE INVESTOR SHOULD REDEEM $3,000 OF SHARES,  A CHARGE WOULD
  BE IMPOSED ON $1,000 OF THE REDEMPTION. THE RATE WOULD BE 5% BECAUSE IT WAS IN
  THE SECOND YEAR AFTER THE PURCHASE WAS MADE AND THE CHARGE WOULD BE $50.
------------------------------------------------------------------------------



REPORTS TO SHAREHOLDERS
------------------------------------------------------------------------------

THE  FUND  WILL  ISSUE  TO  ITS  SHAREHOLDERS  SEMI-ANNUAL  AND  ANNUAL  REPORTS
CONTAINING FINANCIAL STATEMENTS. Financial statements included in annual reports
are audited by the Fund's  independent  certified  public  accountants.  Shortly
after  the end of each  year,  the  Fund  will  furnish  all  shareholders  with
information necessary for preparing their Federal and state income tax returns.

THE LIFETIME INVESTING ACCOUNT/DISTRIBUTION OPTIONS
------------------------------------------------------------------------------

AFTER AN INVESTOR MAKES AN INITIAL PURCHASE OF FUND SHARES,  THE FUND'S TRANSFER
AGENT, THE SHAREHOLDER  SERVICES GROUP,  INC., WILL SET UP A LIFETIME  INVESTING
ACCOUNT  FOR THE  INVESTOR  ON THE FUND'S  RECORDS.  This  account is a complete
record of all transactions  between the investor and the Fund which at all times
shows the balance of shares  owned.  The Fund will not issue share  certificates
except upon request.

    Each  time  a  transaction  takes  place  in a  shareholder's  account,  the
shareholder will receive a statement showing complete details of the transaction
and the current share balance in the account.  (Under certain plans,  statements
may  be  sent  only  quarterly).   THE  LIFETIME  INVESTING  ACCOUNT  PERMITS  A
SHAREHOLDER TO MAKE ADDITIONAL  INVESTMENTS IN SHARES BY SENDING A CHECK FOR $50
OR MORE TO The Shareholder Services Group, Inc.

    Any questions  concerning a shareholder's  account or services available may
be directed by telephone to EATON VANCE  SHAREHOLDER  SERVICES at  800-225-6265,
extension 2, or in writing to The Shareholder Services Group, Inc., BOS725, P.O.
Box 1559, Boston, MA 02104 (please provide the name of the shareholder, the Fund
and the account number).

    THE  FOLLOWING  DISTRIBUTION  OPTIONS  WILL  BE  AVAILABLE  TO ALL  LIFETIME
INVESTING  ACCOUNTS and may be changed as often as desired by written  notice to
the Fund's dividend  disbursing  agent,  The Shareholder  Services Group,  Inc.,
BOS725,  P.O. Box 1559,  Boston,  MA 02104. The currently  effective option will
appear on each confirmation statement.

   Share  Option -- Dividends and capital gains will be reinvested in additional
                    shares.

   Income Option -- Dividends  will  be  paid in cash and capital gains will be
                    reinvested in additional shares.

   Cash  Option  -- Dividends and capital gains will be paid in cash.

    The  Share  Option  will  be  assigned  if no  other  option  is  specified.
Distributions,  including those  reinvested,  will be reduced by any withholding
required under the Federal income tax laws.

    If the Income  Option or Cash  Option  has been  selected,  dividend  and/or
capital gains distribution checks which are returned by the United States Postal
Service as not  deliverable or which remain uncashed for six months or more will
be  reinvested  in the account in shares at the then  current  net asset  value.
Furthermore,  the  distribution  option  on the  account  will be  automatically
changed  to the  Share  Option  until  such  time as the  shareholder  selects a
different option.

    DISTRIBUTION  INVESTMENT OPTION. In addition to the distribution options set
forth above, dividends and/or capital gains may be invested in additional shares
of another Eaton Vance fund. Before selecting this option, a shareholder  should
obtain a prospectus  of the other Eaton Vance fund and  consider its  objectives
and policies carefully.

    "STREET  NAME"  ACCOUNTS.  If shares of the Fund are held in a "street name"
account with an Authorized Firm, all recordkeeping,  transaction  processing and
payments of  distributions  relating to the beneficial  owner's  account will be
performed by the Authorized  Firm,  and not by the Fund and its transfer  agent.
Since the Fund will have no record of the  beneficial  owner's  transactions,  a
beneficial  owner should  contact the  Authorized  Firm to  purchase,  redeem or
exchange shares, to make changes in or give instructions concerning the account,
or to obtain information about the account.  The transfer of shares in a "street
name" account to an account with another  dealer or to an account  directly with
the Fund involves  special  procedures and will require the beneficial  owner to
obtain historical purchase  information about the shares in the account from the
Authorized Firm. Before  establishing a "street name" account with an investment
firm,  or  transferring  the  account to another  investment  firm,  an investor
wishing to reinvest  distributions  should determine whether the firm which will
hold the shares allows reinvestment of distributions in "street name" accounts.

--------------------------------------------------------------------------------
  UNDER  A  LIFETIME   INVESTING  ACCOUNT  A  SHAREHOLDER  CAN  MAKE  ADDITIONAL
  INVESTMENTS BY SENDING A CHECK OF $50 OR MORE.
------------------------------------------------------------------------------

THE EATON VANCE EXCHANGE PRIVILEGE
------------------------------------------------------------------------------

 Shares of the Fund may be  exchanged  for shares of one or more other  funds in
the Eaton Vance Marathon  Group of Funds  (currently  Eaton Vance  Equity-Income
Trust,  Eaton Vance  Liquid  Assets Trust  (until  March 31,  1995),  and any EV
Marathon fund, except EV Marathon Short-Term  Strategic Income Fund, Eaton Vance
Prime  Rate  Reserves  and any EV  Marathon  Limited  Maturity  Fund  which  are
distributed  with a contingent  deferred  sales charge,  on the basis of the net
asset value per share of each fund at the time of the  exchange,  provided  that
such  exchange  offers are  available  only in states  where shares of such fund
being  acquired may be legally sold.  Effective  March 31, 1995, the EV Marathon
Group of Funds will also include EV Marathon  Short-Term  Strategic Income Fund,
any EV Marathon Limited Maturity Fund and, when publicly available,  Eaton Vance
Money Market Fund (availability expected on or about April 3, 1995).

    Each exchange  must involve  shares which have a net asset value of at least
$1,000. The exchange  privilege may be changed or discontinued  without penalty.
Shareholders  will be given sixty (60) days notice prior to any  termination  or
material  amendment  of the  exchange  privilege.  The Fund does not  permit the
exchange privilege to be used for "Market Timing" and may terminate the exchange
privilege for any  shareholder  account engaged in Market Timing  activity.  Any
shareholder account for which more than two round-trip exchanges are made within
any  twelve  month  period  will be  deemed  to be  engaged  in  Market  Timing.
Furthermore,  a group of  unrelated  accounts  for which  exchanges  are entered
contemporaneously  by a financial  intermediary will be considered to be engaged
in Market Timing.

    The Shareholder  Services Group, Inc. makes exchanges at the next determined
net asset value after  receiving an exchange  request in good order (see "How to
Redeem  Fund  Shares").   Consult  The  Shareholder  Services  Group,  Inc.  for
additional  information  concerning  the exchange  privilege.  Applications  and
prospectuses  of the other  funds are  available  from  Authorized  Firms or the
Principal  Underwriter.  The  prospectus  for each fund describes its investment
objectives  and  policies,  and  shareholders  should  obtain a  prospectus  and
consider these objectives and policies carefully before requesting an exchange.

    No contingent  deferred sales charge is imposed on exchanges.  No contingent
deferred sales charge is imposed on exchanges.  For purposes of calculating  the
contingent  deferred  sales  charge  upon  redemption  of shares  acquired in an
exchange, the contingent deferred sales charge schedule applicable to the shares
at the time of purchase will apply and the purchase of shares acquired in one or
more  exchanges is deemed to have occurred at the time of the original  purchase
of the exchanged  shares.  For the  contingent  deferred  sales charge  schedule
applicable  to the EV Marathon  Group of Funds  (except EV  Marathon  Short-Term
Strategic  Income  Fund and Class I shares of any EV Marathon  Limited  Maturity
Fund),  see "How to Redeem Fund Shares".  The  contingent  deferred sales charge
schedule applicable to EV Marathon  Short-Term  Strategic Income Fund or Class I
shares of any EV Marathon  Limited  Maturity  Fund is 3%, 2.5%,  2% or 1% in the
event of a  redemption  occurring  in the first,  second,  third or fourth year,
respectively, after the original share purchase.

    Shares of the other funds in the Eaton Vance  Marathon Group of Funds may be
exchanged  for Fund  shares at net asset  value per  share,  but  subject to any
restrictions or qualifications  set forth in the current  prospectus of any such
fund.

    Telephone  exchanges are accepted by The Shareholder  Services  Group,  Inc.
provided the investor has not disclaimed in writing the use of the privilege. To
effect  such  exchanges,  call The  Shareholder  Services  Group,  Inc.  at 800-
262-1122 or, within  Massachusetts,  617-573-9403,  Monday through Friday,  9:00
a.m. to 4:00 p.m. (Eastern Standard Time). Shares acquired by telephone exchange
must be  registered  in the same name(s) and with the same address as the shares
being exchanged. Neither the Fund, the Principal Underwriter nor The Shareholder
Services  Group,  Inc.,  will be responsible  for the  authenticity  of exchange
instructions  received by  telephone,  provided  that  reasonable  procedures to
confirm that instructions communicated are genuine have been followed. Telephone
instructions  will be tape  recorded.  In times of  drastic  economic  or market
changes,  a telephone  exchange may be difficult to  implement.  An exchange may
result in a taxable gain or loss.

EATON VANCE SHAREHOLDER SERVICES
------------------------------------------------------------------------------

THE FUND OFFERS THE FOLLOWING  SERVICES,  WHICH ARE VOLUNTARY,  INVOLVE NO EXTRA
CHARGE,  AND MAY BE CHANGED OR  DISCONTINUED  WITHOUT  PENALTY AT ANY TIME. Full
information on each of the services  described below and an  application,  where
required, are available from Authorized Firms or the Principal Underwriter.  The
cost  of  administering  such  services  for the  benefit  of  shareholders  who
participate in them is borne by the Fund as an expense to all shareholders.

INVEST-BY-MAIL  -- FOR  PERIODIC  SHARE  ACCUMULATION:  Once the $1,000  minimum
investment has been made, checks of $50 or more payable to the order of the Fund
may be mailed directly to The Shareholder Services Group, Inc., BOS725, P.O. Box
1559,  Boston,  MA  02104  at any  time  --  whether  or not  distributions  are
reinvested. The name of the shareholder,  the Fund and the account number should
accompany each investment.

BANK DRAFT INVESTING -- FOR REGULAR SHARE ACCUMULATION:  Cash investments of $50
or more may be made through the  shareholder's  checking  account via bank draft
each month or quarter.  The $1,000 minimum initial  investment and small account
redemption policy are waived for these accounts.

WITHDRAWAL  PLAN: A shareholder may draw on  shareholdings  systematically  with
monthly or quarterly checks in an aggregate amount that does not exceed annually
12% of the account balance at the time the Plan is established. Such amount will
not be subject to a contingent  deferred  sales charge.  See "How to Redeem Fund
Shares". A minimum deposit of $5,000 in shares is required.

REINVESTMENT PRIVILEGE: A SHAREHOLDER WHO HAS REPURCHASED OR REDEEMED SHARES MAY
REINVEST,  WITH CREDIT FOR ANY  CONTINGENT  DEFERRED  SALES  CHARGES PAID ON THE
REDEEMED  OR  REPURCHASED  SHARES,  ANY  PORTION  OR ALL OF  THE  REPURCHASE  OR
REDEMPTION PROCEEDS (PLUS THAT AMOUNT NECESSARY TO ACQUIRE A FRACTIONAL SHARE TO
ROUND  OFF THE  PURCHASE  TO THE  NEAREST  FULL  SHARE)  IN  SHARES OF THE FUND,
provided that the  reinvestment is effected within 30 days after such repurchase
or  redemption.  Shares  are  sold  to a  reinvesting  shareholder  at the  next
determined net asset value following  timely receipt of a written purchase order
by the Principal  Underwriter or by the Fund (or by the Fund's Transfer  Agent).
To the extent that any shares are sold at a loss and the proceeds are reinvested
in shares  of the Fund (or other  shares  of the Fund are  acquired  within  the
period  beginning  30  days  before  and  ending  30  days  after  the  date  of
redemption),  some or all of the loss  generally  will not be  allowed  as a tax
deduction.  Shareholders  should  consult their tax advisers  concerning the tax
consequences of reinvestments.

TAX-SHELTERED RETIREMENT PLANS:  Shares of the Fund are available for purchase
in connection with the following tax-sheltered retirement plans:

    --Pension and Profit Sharing Plans for self-employed individuals,
      corporations and non-profit organizations;

    --Individual Retirement Account Plans for individuals and their non-
      employed spouses; and

    --403(b) Retirement Plans for employees of public school systems, hospitals,
      colleges and other non-profit  organizations  meeting certain requirements
      of the Internal Revenue Code.

    Detailed information concerning these plans, including certain exceptions to
minimum investment requirements,  and copies of the plans are available from the
Principal   Underwriter.   This   information   should  be  read  carefully  and
consultation  with an attorney or tax adviser may be advisable.  The information
sets forth the  service  fee  charged for  retirement  plans and  describes  the
Federal  income  tax  consequences  of  establishing  a plan.  Under all  plans,
dividends  and  distributions  will be  automatically  reinvested  in additional
shares.

DISTRIBUTIONS AND TAXES
------------------------------------------------------------------------------

DISTRIBUTIONS
    It is the present  policy of the Fund to make (A) at least one  distribution
annually  (normally in December) of all or  substantially  all of its investment
income earned, less its expenses, and (B) at least one distribution (normally in
December) of all or  substantially  all of the net capital gains (reduced by any
available capital loss  carryforwards from prior years) realized by the Fund, if
any.

    Shareholders  may  reinvest all  distributions  in shares of the Fund at net
asset value as of the close of business on the record date.

TAXES
    Distributions  of the Fund from its net  investment  income,  net short-term
capital gains and certain foreign  exchange gains are taxable to shareholders as
ordinary income,  whether received in cash or reinvested in additional shares. A
portion of distributions  from the Fund's net investment  income may qualify for
the dividends-received deduction for corporate shareholders.

    Capital gains referred to in clause (B) above, if any,  realized on sales of
investments  and on  options,  futures  and  certain  forward  foreign  currency
exchange  transactions  during the fiscal year, which ends on September 30, will
usually be  distributed  prior to the end of  December.  Distributions  from the
Fund's net  long-term  capital  gains are taxable to  shareholders  as long-term
capital  gains,  whether  paid in cash or  additional  shares  of the  Fund  and
regardless of the length of time Fund shares have been owned by the shareholder.

    If shares are purchased  shortly  before the record date of a  distribution,
the  shareholder  will pay the full price for the shares and then  receive  some
portion  of the price back as a taxable  distribution.  The  amount,  timing and
character of  distributions to shareholders may be affected by special tax rules
governing the Fund's activities in options, futures and forward foreign currency
exchange transactions.

    Certain distributions declared in October, November or December and paid the
following  January will be taxable to shareholders as if received on December 31
of the year in which they are declared.

    The Fund may be  required  to pay  foreign  taxes  with  respect  to  income
(possibly  including,  in  some  cases,  capital  gains)  that it  derives  from
investments in foreign  securities.  If more than 50% of the value of the Fund's
total  assets  at the close of its  taxable  year  (September  30)  consists  of
securities in foreign corporations,  the Fund may make an election under Section
853 of the Code to pass through to its shareholders the right to take the credit
or deduction for qualifying foreign taxes paid by the Fund during such year. The
Fund will send a written  notice of any such  election  (not  later than 60 days
after the close of its taxable year) to each  shareholder  indicating the amount
to be treated  as the  proportionate  share of such  taxes paid to each  foreign
country or U.S.  possession and the portion of the distribution which represents
income  derived  from  sources  within  each  country or U.S.  possession.  Each
shareholder  will include in gross income (in addition to taxable  distributions
received  from the Fund) the  proportionate  share of such taxes,  and can treat
such amount as paid by such  shareholder for purposes of the deduction or credit
for  foreign  taxes  on  the   shareholders   own  Federal  income  tax  return.
Availability  of the deduction or credit for foreign taxes is subject to certain
tax restrictions.

    Shareholders  will  receive  annually  one or more  Forms  1099 to assist in
reporting  on their  Federal and state  income tax  returns  the prior  calendar
year's  distributions,  proceeds from the redemption or exchange of Fund shares,
and Federal income tax (if any) withheld by the Fund's Transfer Agent.

--------------------------------------------------------------------------------
  AS A REGULATED  INVESTMENT  COMPANY UNDER THE INTERNAL  REVENUE CODE, THE FUND
  DOES NOT PAY FEDERAL  INCOME OR EXCISE TAXES TO THE EXTENT THAT IT DISTRIBUTES
  TO SHAREHOLDERS  ITS NET INVESTMENT  INCOME AND NET REALIZED  CAPITAL GAINS IN
  THE MANNER REQUIRED BY THE CODE.
------------------------------------------------------------------------------
PERFORMANCE INFORMATION
------------------------------------------------------------------------------

FROM TIME TO TIME,  THE FUND MAY ADVERTISE ITS YIELD AND/OR AVERAGE ANNUAL TOTAL
RETURN.  The current  yield for the Fund will be  calculated by dividing the net
investment  income  per  share  during a recent  30 day  period  by the  maximum
offering  price per share (net  asset  value) of the Fund on the last day of the
period and  annualizing  the resulting  figure.  The Fund's average annual total
return is determined by computing the average annual  percentage change in value
of $1,000  invested at the maximum  public  offering price (net asset value) for
specified  periods  ending  with  the most  recent  calendar  quarter,  assuming
reinvestment  of all  distributions.  The  total  return  calculation  assumes a
complete  redemption  of the  investment  and the  deduction  of any  contingent
deferred sales charge at the end of the period. The Fund may also publish annual
and cumulative total return figures from time to time.

    The  Fund may also  publish  total  return  figures  which do not take  into
account  any  contingent  deferred  sales  charge  which  may  be  imposed  upon
redemptions at the end of the specified  period.  Any  performance  figure which
does not take into account the contingent deferred sales charge would be reduced
to the extent such charge is imposed upon a redemption.

    Investors should note that the investment results of the Fund will fluctuate
over time, and any  presentation of the Fund's current yield or total return for
any prior period should not be considered a representation of what an investment
may  earn or what an  investor's  yield  or total  return  may be in any  future
period.

<PAGE>
INVESTMENT ADVISER
Eaton Vance Management
24 Federal Street
Boston, MA 02110

PRINCIPAL UNDERWRITER
Eaton Vance Distributors, Inc.
24 Federal Street
Boston, MA 02110
(800) 225-6265

CUSTODIAN
Investors Bank & Trust Company
24 Federal Street
Boston, MA 02110

TRANSFER AGENT
The Shareholder Services Group, Inc.
BOS725
P.O. Box 1559
Boston, MA 02104
(800) 262-1122

AUDITORS
Deloitte & Touche LLP
125 Summer Street
Boston, MA 02110

EV MARATHON GOLD &
NATURAL RESOURCES FUND
24 FEDERAL STREET
BOSTON, MA 02110

NRP

EV MARATHON GOLD &
NATURAL RESOURCES
FUND


PROSPECTUS
FEBRUARY 1, 1995



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