WITTER DEAN NATURAL RESOURCE DEVELOPMENT SECURITIES INC
497, 1996-05-07
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<PAGE>
                        DEAN WITTER
                        NATURAL RESOURCE DEVELOPMENT SECURITIES
                        PROSPECTUS--APRIL 23, 1996
 
- -------------------------------------------------------------------------------
 
DEAN  WITTER NATURAL  RESOURCE DEVELOPMENT  SECURITIES INC.  (THE "FUND")  IS AN
OPEN-END DIVERSIFIED MANAGEMENT INVESTMENT COMPANY WHOSE INVESTMENT OBJECTIVE IS
CAPITAL GROWTH. THE FUND INVESTS PRIMARILY  IN COMMON STOCK OF COMPANIES IN  THE
NATURAL  RESOURCES  AND  RELATED  AREAS,  INCLUDING  COMPANIES  ENGAGED  IN  THE
EXPLORATION  FOR  AND  DEVELOPMENT,  PRODUCTION  AND  DISTRIBUTION  OF   NATURAL
RESOURCES  OR  IN  THE  DEVELOPMENT OF  ENERGY-EFFICIENT  TECHNOLOGIES  OR OTHER
NATURAL RESOURCE RELATED  SUPPLIES OR PRODUCTS.  (SEE "INVESTMENT OBJECTIVE  AND
POLICIES.")
 
Shares  of  the  Fund are  continuously  offered  at net  asset  value. However,
redemptions and/or repurchases are subject in most circumstances to a contingent
deferred sales charge, scaled down from 5% to 1% of the amount redeemed, if made
within six  years  of  purchase,  which  charge  will  be  paid  to  the  Fund's
Distributor,  Dean Witter Distributors Inc.  (See "Redemptions and Repurchases--
Contingent Deferred Sales Charge.") In addition, the Fund pays the Distributor a
distribution fee pursuant to a Plan of Distribution at the annual rate of 1%  of
the  lesser of the (i) average daily  aggregate net sales since inception of the
Plan of Distribution or (ii) average  daily net assets of the Fund  attributable
to shares issued since the inception of the Plan of Distribution. (See "Purchase
of Fund Shares--Plan of Distribution.")
 
This  Prospectus sets  forth concisely  the information  you should  know before
investing in the  Fund. It  should be read  and retained  for future  reference.
Additional  information  about  the  Fund  is  contained  in  the  Statement  of
Additional Information, dated  April 23,  1996, which  has been  filed with  the
Securities  and Exchange  Commission, and which  is available at  no charge upon
request of the Fund at the address or telephone numbers listed on this page. The
Statement of Additional Information is incorporated herein by reference.
 
<TABLE>
<CAPTION>
TABLE OF CONTENTS
 
<S>                                                 <C>
Prospectus Summary................................       2
Summary of Fund Expenses..........................       3
Financial Highlights..............................       4
The Fund and its Management.......................       5
Investment Objective and Policies.................       5
  Risk Considerations and Investment Practices....       5
Investment Restrictions...........................       8
Purchase of Fund Shares...........................       9
Shareholder Services..............................      10
Redemptions and Repurchases.......................      12
Dividends, Distributions and Taxes................      14
Performance Information...........................      14
Additional Information............................      15
</TABLE>
 
SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, AND THE  SHARES ARE NOT FEDERALLY  INSURED BY THE FEDERAL  DEPOSIT
INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY.
 
DEAN WITTER
NATURAL RESOURCE DEVELOPMENT
SECURITIES INC.
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
(212) 392-2550 or (800) 869-NEWS (toll-free)
 
- --------------------------------------------------------------------------------
 
  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.
 
                   DEAN WITTER DISTRIBUTORS INC., DISTRIBUTOR
<PAGE>
PROSPECTUS SUMMARY
- --------------------------------------------------------------------------------
 
<TABLE>
<S>             <C>
THE FUND        The  Fund,  a Maryland  corporation, is  an  open-end diversified  management investment
                company investing primarily in  common stock of companies  in the natural resources  and
                related areas.
- -------------------------------------------------------------------------------------------------------
 
SHARES OFFERED  Common Stock with $0.01 par value (see page 15).
- -------------------------------------------------------------------------------------------------------
 
OFFERING        At  net asset  value. (see  page 9). Shares  redeemed within  six years  of purchase are
PRICE           subject to a contingent deferred sales charge under most circumstances (see page 13).
- -------------------------------------------------------------------------------------------------------
 
MINIMUM         Minimum  initial   investment  $1,000;   ($100  if   the  account   is  opened   through
PURCHASE        EasyInvest -SM-); minimum subsequent investment $100 (see page 9).
- -------------------------------------------------------------------------------------------------------
 
INVESTMENT      The investment objective of the Fund is capital growth.
OBJECTIVE
- -------------------------------------------------------------------------------------------------------
 
INVESTMENT      Dean  Witter InterCapital Inc. ("InterCapital"), the Investment Manager of the Fund, and
MANAGER         its wholly-owned  subsidiary,  Dean  Witter  Services Company  Inc.,  serve  in  various
                investment  management, advisory, management and administrative capacities to ninety-six
                investment companies and other portfolios with assets of approximately $82.5 billion  at
                February 29, 1996 (see page 4).
- -------------------------------------------------------------------------------------------------------
 
MANAGEMENT      The  Investment Manager receives a monthly fee at an annual rate of 0.625 of 1% of daily
FEE             net assets up to $250 million and 0.50 of 1% of daily net assets over $250 million.
- -------------------------------------------------------------------------------------------------------
 
DIVIDENDS AND   Dividends from net  investment income dividends  paid annually; capital  gains, if  any,
CAPITAL GAINS   distributed  annually or  retained for reinvestment  by the Fund.  Dividends and capital
DISTRIBUTIONS   gains distributions automatically  reinvested in  additional shares at  net asset  value
                unless the shareholder elects to receive cash (see page 14).
- -------------------------------------------------------------------------------------------------------
 
DISTRIBUTOR     Dean  Witter Distributors  Inc. (the "Distributor").  The Distributor  receives from the
                Fund a distribution fee accrued daily and payable monthly at the rate of 1.0% per  annum
                of  the lesser of  (a) the Fund's  average daily aggregate  net sales or  (b) the Fund's
                average daily net assets. This fee compensates the Distributor for the services provided
                in distributing shares of the Fund and for  its sales related expenses (see pages 9  and
                13).  The  Distributor  also receives  the  proceeds  of any  contingent  deferred sales
                charges.
- -------------------------------------------------------------------------------------------------------
 
REDEMPTION--    Shares are  redeemable  by  the shareholder  at  net  asset value.  An  account  may  be
CONTINGENT      involuntarily  redeemed if the total value of the  account is less than $100, or, if the
DEFERRED        account was opened through EasyInvest -SM-,  if after twelve months the shareholder  has
SALES CHARGE    invested  less than  $1,000 in the  account. Although  no commission or  sales charge is
                imposed upon the  purchase of shares,  a contingent deferred  sales charge (scaled  down
                from 5% to 1%) is imposed on any redemption of shares which causes the aggregate current
                value  of an account with the Fund to  fall below the aggregate amount of the investor's
                purchase payments made during  the preceding six  years. There is  no charge imposed  on
                redemption  of shares purchased through reinvestment  of dividends or distributions (see
                page 13).
- -------------------------------------------------------------------------------------------------------
 
RETIREMENT      You can take advantage of tax benefits for personal retirement accounts by investing  in
PLANS           the  Fund  through an  IRA (Individual  Retirement Account)  or Custodial  Account under
                Section 403(b)(7) of the Internal Revenue Code (see page 11).
- -------------------------------------------------------------------------------------------------------
 
RISKS           The net asset value of the Fund's shares will fluctuate with changes in market value  of
                portfolio  securities.  Emphasis on  natural resources  may result  in exposure  of some
                companies to foreign  political and  currency risks and  substantial price  fluctuations
                (see  page 5). Investors should review the investment objective and policies of the Fund
                carefully and consider their ability to  assume the risks involved in purchasing  shares
                of  the Fund (see pages  5 through 8). The  Fund may also invest  in futures and options
                which may be considered speculative in nature  and may involve greater risks than  those
                customarily  assumed  by  other  investment  companies  which  do  not  invest  in  such
                instruments (see  pages 7  through 8).  In addition,  the investor  is directed  to  the
                discussions of foreign securities on page 5.
- -------------------------------------------------------------------------------------------------------
</TABLE>
 
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                          ELSEWHERE IN THE PROSPECTUS
                AND IN THE STATEMENT OF ADDITIONAL INFORMATION.
 
2
<PAGE>
SUMMARY OF FUND EXPENSES
- --------------------------------------------------------------------------------
 
The  following table illustrates all expenses and fees that a shareholder of the
Fund will incur. The expenses and fees set forth in the table are for the fiscal
year ended February 29, 1996, except as otherwise noted.
 
<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES
<S>                                                 <C>
Maximum Sales Charge Imposed on Purchases.........   None
Maximum Sales Charge Imposed on Reinvested
 Dividends........................................   None
Deferred Sales Charge
 (as a percentage of the lesser of original
 purchase price or redemption proceeds)...........   5.0%
</TABLE>
 
 A contingent deferred sales charge is imposed at the following declining rates:
 
<TABLE>
<CAPTION>
                                                    PERCENTAGE
                                                        OF
                                                      AMOUNT
YEAR SINCE PURCHASE PAYMENT MADE                     REDEEMED
- --------------------------------------------------  -----------
<S>                                                 <C>
First.............................................      5.0%
Second............................................      4.0%
Third.............................................      3.0%
Fourth............................................      2.0%
Fifth.............................................      2.0%
Sixth.............................................      1.0%
Seventh and thereafter............................     None
</TABLE>
 
<TABLE>
<S>                                                 <C>
Redemption Fees...................................   None
Exchange Fees.....................................   None
 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF
 AVERAGE NET ASSETS)
Management Fees...................................  0.63%
12b-1 Fees*.......................................  0.97%
Other Expenses....................................  0.30%
Total Fund Operating Expenses.....................  1.90%
<FN>
- ------------------------
* A portion of the 12b-1 fee, which  may not exceed 0.25% of the Fund's  average
  daily  net assets,  is characterized  as a service  fee within  the meaning of
  National Association of Securities Dealers ("NASD") guidelines (see  "Purchase
  of Fund Shares").
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                    10
EXAMPLE                                             1 YEAR    3 YEARS   5 YEARS    YEARS
- --------------------------------------------------  -------   -------   -------   -------
<S>                                                 <C>       <C>       <C>       <C>
You  would pay the following  expenses on a $1,000
 investment, assuming (1) 5% annual return and (2)
 redemption at the end of each time period........    $69       $90       $123      $222
You would pay the  following expenses on the  same
 investment, assuming no redemption...............    $19       $60       $103      $222
</TABLE>
 
THE  ABOVE EXAMPLE SHOULD NOT  BE CONSIDERED A REPRESENTATION  OF PAST OR FUTURE
EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE FUND MAY BE GREATER OR LESS THAN
THOSE SHOWN.
 
The purpose of this table is to assist the investor in understanding the various
costs and  expenses  that  an  investor  in  the  Fund  will  bear  directly  or
indirectly.  For a  more complete description  of these costs  and expenses, see
"The Fund  and its  Management,"  "Plan of  Distribution" and  "Redemptions  and
Repurchases."
 
Long-term   shareholders  of  the  Fund  may  pay  more  in  sales  charges  and
distribution fees than the  economic equivalent of  the maximum front-end  sales
charges permitted by the NASD.
 
                                                                               3
<PAGE>
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
 
The following ratios and per share data for a share of capital stock outstanding
throughout  each period have  been audited by  Price Waterhouse LLP, independent
accountants. The financial  highlights should  be read in  conjunction with  the
financial  statements, notes thereto, and  the unqualified report of independent
accountants which  are contained  in the  Statement of  Additional  Information.
Further information about the performance of the Fund is contained in the Fund's
Annual Report to Shareholders, which may be obtained without charge upon request
to the Fund.
 
<TABLE>
<CAPTION>
                                                       FOR THE YEAR ENDED FEBRUARY 28
                        ---------------------------------------------------------------------------------------------
                         1996*     1995     1994     1993    1992*     1991     1990      1989      1988*      1987
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
<S>                     <C>       <C>      <C>      <C>      <C>      <C>      <C>       <C>       <C>       <C>
PER SHARE OPERATING
  PERFORMANCE:
Net asset value,
  beginning of
  period..............  $10.77    $11.82   $11.36   $10.20   $11.03   $11.33    $9.93     $9.46     $9.10     $7.43
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Net investment
   income.............   0.06      0.09     0.09     0.16     0.20     0.25      0.30      0.23      0.20      0.14
  Net realized and
   unrealized gain
   (loss).............   2.53     (0.24)    1.25     1.18    (0.44)    0.02      1.80      0.72      0.44      1.75
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Total from
   investment
   operations.........   2.59     (0.15)    1.34     1.34    (0.24)    0.27      2.10      0.95      0.64      1.89
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Less dividends and
   distributions from:
    Net investment
     income...........  (0.04)    (0.12)   (0.09)   (0.18)   (0.20)   (0.28)    (0.32)    (0.21)    (0.28)    (0.22)
    Net realized
     gain.............  (0.62)    (0.78)   (0.79)    --      (0.39)   (0.29)    (0.38)    (0.27)     --        --
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Total dividends and
   distributions......  (0.66)    (0.90)   (0.88)   (0.18)   (0.59)   (0.57)    (0.70)    (0.48)    (0.28)    (0.22)
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Net asset value,
   end of period......  $12.70    $10.77   $11.82   $11.36   $10.20   $11.03   $11.33     $9.93     $9.46     $9.10
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
TOTAL INVESTMENT
  RETURN+.............  24.32%    (1.26)%  12.16%   13.31%   (1.91)%   2.87%    21.11%    10.29%     7.32%    26.21%
RATIOS TO AVERAGE NET
  ASSETS:
  Expenses............   1.90%     1.90%    1.91%    1.96%    1.93%    1.80%     1.81%     1.92%     1.81%     1.74%
  Net investment
   income.............   0.52%     0.77%    0.73%    1.46%    1.67%    2.28%     2.57%     2.09%     2.14%     2.61%
SUPPLEMENTAL DATA:
  Net assets, end of
   period, in
   thousands..........  $152,661  $132,812 $139,459 $118,496 $113,145 $150,636 $154,741  $136,911  $171,725  $82,985
  Portfolio turnover
   rate...............     49%       59%      69%      52%      31%      29%       22%        7%       26%       14%
</TABLE>
 
- ------------------------------
* YEAR ENDED FEBRUARY 29.
 
+ DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE.
 
4
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
Dean  Witter Natural  Resource Development  Securities Inc.  (the "Fund")  is an
open-end diversified management investment  company incorporated in Maryland  on
December 22, 1980.
 
    Dean  Witter InterCapital Inc. ("InterCapital" or the "Investment Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the Fund's
investment manager.  The Investment  Manager, which  was incorporated  in  July,
1992,  is a wholly-owned subsidiary  of Dean Witter, Discover  & Co. ("DWDC"), a
balanced financial services organization providing  a broad range of  nationally
marketed credit and investment products.
 
    InterCapital  and its wholly-owned subsidiary,  Dean Witter Services Company
Inc.,  serve  in  various   investment  management,  advisory,  management   and
administrative  capacities to  ninety-six investment companies,  thirty of which
are listed  on  the New  York  Stock Exchange,  with  combined total  assets  of
approximately $79.9 billion as of February 29, 1996. The Investment Manager also
manages  and  advises  portfolios  of  pension  plans,  other  institutions  and
individuals which aggregated approximately $2.6 billion at such date.
 
    The Fund  has  retained the  Investment  Manager to  provide  administrative
services,  manage its business  affairs and manage the  investment of the Fund's
assets, including the placing of orders  for the purchase and sale of  portfolio
securities.  InterCapital  has retained  Dean  Witter Services  Company  Inc. to
perform the aforementioned administrative services to the Fund.
 
    The Fund's Board of Directors reviews  the various services provided by  the
Investment  Manager to  ensure that the  Fund's general  investment policies and
programs are being  properly carried  out and that  administrative services  are
being provided to the Fund in a satisfactory manner.
 
    As  full compensation for the services  and facilities furnished to the Fund
and for expenses of the  Fund assumed by the  Investment Manager, the Fund  pays
the  Investment Manager  monthly compensation  calculated daily  by applying the
following annual rates to the net assets of the Fund determined as of the  close
of  each  business  day: 0.625%  of  the portion  of  the daily  net  assets not
exceeding $250  million  and  0.50% of  the  portion  of the  daily  net  assets
exceeding  $250 million. For the  fiscal year ended February  29, 1996, the Fund
accrued total compensation to the Investment  Manager amounting to 0.63% of  the
Fund's  average daily net assets and the Fund's total expenses amounted to 1.90%
of the Fund's average daily net assets.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
The investment objective of  the Fund is capital  growth. There is no  assurance
that  the objective will be achieved. This  objective is fundamental and may not
be changed without the approval of the  stockholders of the Fund. The Fund  will
invest  primarily  in common  stock of  companies in  the natural  resources and
related areas, and  will invest at  least 65% of  its net assets  at all  times,
except  for temporary  and defensive  purposes, in  the securities  of companies
engaged in these areas. A portfolio company is considered to be so engaged  when
at least 50% of its assets and/or revenues are currently the result of ownership
or  development of assets in such areas. Such companies include those engaged in
the exploration  for and  development, production  and distribution  of  natural
resources,  in  the development  of  energy-efficient technologies  or  in other
natural resource related supplies or services.
 
    The Fund will  seek capital  growth by  investing in  securities of  issuers
believed to be responsive to domestic and world demand for natural resources. As
a  result  of  the challenges  presented  by  natural resource  needs,  the Fund
believes that opportunities  for growth can  be found in  securities of  issuers
which:  (1) own  or process  natural resources,  such as  precious metals, other
minerals, water, timberland and forest products;  (2) own or produce sources  of
energy  such  as oil,  natural  gas, coal,  uranium,  geothermal, oil  shale and
biomass; (3)  participate in  the  exploration for  and development  of  natural
resources  supplies from new  and conventional sources; (4)  own or control oil,
gas, or  other mineral  leases  (which may  not  produce recoverable  energy  or
resources),   rights  or  royalty  interests;   (5)  provide  natural  resources
transportation, distribution  or  processing  services,  such  as  refining  and
pipeline  services; (6) provide related services  or supplies, such as drilling,
well  servicing,   chemicals,   parts   and  equipment;   and   (7)   contribute
energy-efficient   technologies,   such  as   systems  for   energy  conversion,
conservation and pollution control. Emphasis on natural resources may result  in
exposure of some portfolio companies to foreign political and currency risks and
substantial price fluctuations.
 
    The Fund may purchase securities on a when issued or delayed delivery basis,
may  purchase or sell securities on a  forward commitment basis and may purchase
securities on  a "when,  as and  if  issued" basis,  may enter  into  repurchase
agreements  and may invest in options  and futures transactions all as described
below.
 
RISK CONSIDERATIONS AND
INVESTMENT PRACTICES
 
FOREIGN SECURITIES.  Foreign securities  investments may be affected by  changes
in currency rates or exchange
con-
 
                                                                               5
<PAGE>
trol regulations, changes in governmental administration or economic or monetary
policy  (in the United  States and abroad) or  changed circumstances in dealings
between nations.  Fluctuations in  the relative  rates of  exchange between  the
currencies  of different nations will affect the value of the Fund's investments
denominated in  foreign currency.  Changes in  foreign currency  exchange  rates
relative  to the  U.S. dollar will  affect the  U.S. dollar value  of the Fund's
assets denominated in  that currency and  thereby impact upon  the Fund's  total
return on such assets.
 
    Foreign  currency  exchange rates  are determined  by  forces of  supply and
demand on the foreign exchange markets. These forces are themselves affected  by
the   international  balance  of  payments  and  other  economic  and  financial
conditions, government intervention,  speculation and  other factors.  Moreover,
foreign currency exchange rates may be affected by the regulatory control of the
exchanges on which the currencies trade.
 
    Investments  in  foreign securities  will  also occasion  risks  relating to
political  and  economic  developments  abroad,  including  the  possibility  of
expropriations  or confiscatory taxation, limitations on  the use or transfer of
Fund  assets  and  any  effects   of  foreign  social,  economic  or   political
instability. Foreign companies are not subject to the regulatory requirements of
U.S.  companies and, as  such, there may be  less publicly available information
about such companies.  Moreover, foreign  companies are not  subject to  uniform
accounting,   auditing  and  financial   reporting  standards  and  requirements
comparable to those applicable to U.S. companies.
 
    Securities of foreign issuers may be less liquid than comparable  securities
of  U.S.  issuers  and, as  such,  their  price changes  may  be  more volatile.
Furthermore, foreign exchanges and broker-dealers are generally subject to  less
government   and   exchange  scrutiny   and   regulation  than   their  American
counterparts. Brokerage commissions,  dealer concessions  and other  transaction
costs may be higher on foreign markets than in the U.S. In addition, differences
in clearance and settlement procedures on foreign markets may occasion delays in
settlements  of  the  Fund's  trades  effected in  such  markets.  As  such, the
inability to  dispose of  portfolio securities  due to  settlement delays  could
result  in  losses to  the  Fund due  to subsequent  declines  in value  of such
securities and the inability of the Fund to make intended security purchases due
to settlement problems could result in a failure of the Fund to make potentially
advantageous  investments.  To   the  extent  the   Fund  purchases   Eurodollar
certificates  of deposit  issued by foreign  branches of  domestic Unites States
banks, consideration will be  given to their  domestic marketability, the  lower
reserve  requirements  normally mandated  for  overseas banking  operations, the
possible  impact  of  interruptions  in  the  flow  of  international   currency
transactions  and future international political and economic developments which
might adversely affect the payment of principal or interest.
 
PRIVATE PLACEMENTS.   The  Fund may  invest  up to  5% of  its total  assets  in
securities  which are  subject to restrictions  on resale because  they have not
been registered under the  Securities Act of 1933,  as amended (the  "Securities
Act"),  or which are otherwise not  readily marketable. (Securities eligible for
resale pursuant to  Rule 144A  under the Securities  Act, and  determined to  be
liquid  pursuant to the procedures discussed in the following paragraph, are not
subject to the foregoing restriction).  These securities are generally  referred
to  as private placements or restricted securities. Limitations on the resale of
such securities  may have  an adverse  effect on  their marketability,  and  may
prevent  the Fund from disposing of them promptly at reasonable prices. The Fund
may have to bear the expense of  registering such securities for resale and  the
risk of substantial delays in effecting such registration.
 
    The  Securities  and Exchange  Commission has  adopted  Rule 144A  under the
Securities Act,  which  permits  the  Fund  to  sell  restricted  securities  to
qualified  institutional  buyers  without  limitation.  The  Investment Manager,
pursuant to  procedures  adopted by  the  Directors of  the  Fund, will  make  a
determination  as to the liquidity of  each restricted security purchased by the
Fund. If a restricted security is determined to be "liquid," such security  will
not  be included within the category  "illiquid securities," which under current
policy may not exceed 15% of the Fund's total assets.
 
REPURCHASE AGREEMENTS.  The Fund may enter into repurchase agreements, which may
be viewed as a type of secured lending by the Fund, and which typically  involve
the  acquisition  by  the  Fund  of debt  securities  from  a  selling financial
institution such as a bank, savings  and loan association or broker-dealer.  The
agreement provides that the Fund will sell back to the institution, and that the
institution will repurchase, the underlying security at a specified price and at
a  fixed time in the future,  usually not more than seven  days from the date of
purchase. While repurchase agreements involve certain risks not associated  with
direct  investments in debt securities, the  Fund follows procedures designed to
minimize those risks. See the Statement of Additional Information for a  further
discussion of such investments.
 
ZERO  COUPON SECURITIES.  A portion  of the fixed-income securities purchased by
the Fund  may be  zero coupon  securities. Such  securities are  purchased at  a
discount from their face amount, giving the purchaser the right to receive their
full  value at maturity. The interest  earned on such securities is, implicitly,
automatically compounded and paid out at  maturity. While such compounding at  a
constant rate eliminates the risk of receiving lower yields upon reinvestment of
interest  if  prevailing interest  rates  decline, the  owner  of a  zero coupon
security will be  unable to participate  in higher yields  upon reinvestment  of
interest  received on  interest-paying securities  if prevailing  interest rates
rise.
 
6
<PAGE>
    A zero  coupon security  pays no  interest to  its holder  during its  life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive  current cash available  for distribution to  shareholders. In addition,
zero coupon securities are subject  to substantially greater price  fluctuations
during  periods  of  changing  prevailing  interest  rates  than  are comparable
securities which  pay interest  on  a current  basis.  Current federal  tax  law
requires  that a holder  (such as the Fund)  of a zero  coupon security accrue a
portion of the discount at which the security was purchased as income each  year
even  though the  Fund receives  no interest  payments in  cash on  the security
during the year.
 
OPTIONS AND FUTURES TRANSACTIONS
 
The Fund may purchase and sell (write)  call and put options on debt and  equity
securities  which are  listed on  Exchanges or  are written  in over-the-counter
transactions ("OTC  Options"). Listed  options, which  are currently  listed  on
several  different  Exchanges, are  issued by  the Options  Clearing Corporation
("OCC"). OTC  options  are  purchased  from or  sold  (written)  to  dealers  or
financial  institutions which have entered into direct agreements with the Fund.
The Fund  will  engage  in  OTC  option  transactions  only  with  primary  U.S.
Government  securities dealers  recognized by  the Federal  Reserve Bank  of New
York. The Fund will not write covered options on portfolio securities  exceeding
in the aggregate 25% of the value of its total assets.
 
    The Fund may invest up to 10% of its total assets in the purchase of put and
call options on securities and stock indexes, with a maximum of 5% of the Fund's
total  assets invested in stock index options. The Fund may purchase put options
on securities which it holds (or has the right to acquire) in its portfolio only
to protect itself against a decline in  the value of the security. The Fund  may
also purchase put options to close out written put positions. There are no other
limits on the Fund's ability to purchase call and put options. The Fund may also
purchase  and write options on stock indexes.  See "Risks of Options on Indexes"
in the Statement of Additional Information.
 
    The Fund may also  purchase and sell interest  rate and stock index  futures
contracts  ("futures contracts") that are traded  on U.S. commodity exchanges on
such underlying securities  as U.S. Treasury  bonds, notes, and  bills and  GNMA
Certificates ("interest rate" futures) and such indexes as the S&P 500 Index and
the  New York  Stock Exchange  Composite Index  ("stock index"  futures) and the
Moody's Investment-Grade Corporate Bond Index  ("bond index" futures). The  Fund
will  purchase or  sell interest rate  futures contracts and  bond index futures
contracts for the purpose of hedging its fixed-income portfolio (or  anticipated
portfolio)  securities against  changes in  prevailing interest  rates. The Fund
will purchase or sell stock index  futures contracts for the purpose of  hedging
its  equity portfolio (or  anticipated portfolio) securities  against changes in
their prices.
 
    The Fund  also  may purchase  and  write call  and  put options  on  futures
contracts  and enter into  closing transactions with respect  to such options to
terminate an existing position.
RISKS OF OPTIONS AND FUTURES TRANSACTIONS.  The Fund may close out its  position
as  writer of an option, or as a buyer or seller of a futures contract only if a
liquid secondary market exists for options or futures contracts of that  series.
There  is no assurance that such a  market will exist. Also, exchanges may limit
the amount by which the price of many futures contracts may move on any day.  If
the  price moves  equal the daily  limit on  successive days, then  it may prove
impossible to liquidate  a futures  position until  the daily  limit moves  have
ceased.  The  extent to  which the  Fund may  enter into  transactions involving
options and futures  contracts may  be limited  by the  Internal Revenue  Code's
requirements  for qualification as a regulated investment company and the Fund's
intention to qualify as such. See "Dividends, Distributions and Taxes."
 
    While the futures contracts and options transactions to be engaged in by the
Fund for  the  purpose  of  hedging the  Fund's  portfolio  securities  are  not
speculative  in nature, there are risks inherent in the use of such instruments.
One such  risk  is  that  the  Investment Manager  could  be  incorrect  in  its
expectations  as to the  direction or extent  of various interest  rate or price
movements or the time span within  which the movements take place. For  example,
if the Fund sold futures contracts for the sale of securities in anticipation of
an  increase in interest rates, and then  interest rates went down, causing bond
prices to rise, the Fund would incur a loss on the sale. Another risk which  may
arise  in employing futures contracts to protect against the price volatility of
portfolio securities is  that the prices  of securities and  indexes subject  to
futures  contracts  (and thereby  the  futures contracts  prices)  may correlate
imperfectly with  the  behavior of  the  cash  prices of  the  Fund's  portfolio
securities.  See the Statement of  Additional Information for further discussion
of such risks.
 
    New futures  contracts, options  and other  financial products  and  various
combinations  thereof continue to be developed. The  Fund may invest in any such
futures, options or products as may be developed, to the extent consistent  with
its investment objective and applicable regulatory requirements.
 
SPECIFIC INVESTMENT POLICIES
 
The  Fund has adopted the following  specific policies which are not fundamental
investment policies and which may be changed by the Fund's Board of Directors:
 
        (1) At least 65% of the Fund's  total assets will be invested in  common
    stock  of  domestic and  foreign companies  in  the natural  resources areas
    described above. The  Fund may  also invest in  securities convertible  into
    common stock and may acquire warrants and
 
                                                                               7
<PAGE>
    other  rights  to  acquire  common stock  in  connection  with  purchases of
    portfolio securities.
 
        (2) The Fund may invest in securities of foreign companies. However, the
    Fund will not invest more than 10%  of its net assets in securities of  such
    issuers   (other  than  Canadian  issuers  on  which  there  is  no  limit).
    Investments in certain Canadian  issuers may be  speculative due to  certain
    political  risks and may  be subject to  substantial price fluctuations. The
    Fund's investments in unlisted foreign securities are deemed to be  illiquid
    securities,  which under the  Fund's current investment  policies may not in
    the aggregate amount to  more than 15% of  the Fund's total assets.  Foreign
    securities  investments  may be  affected by  changes  in currency  rates or
    exchange control  regulations,  changes in  governmental  administration  or
    economic  or monetary  policy (in the  United States and  abroad) or changed
    circumstances  in  dealings  between  nations.  Costs  may  be  incurred  in
    connection with conversions between various currencies held by the Fund.
 
        (3)  Up to 35% of  the value of the Fund's  total assets may be invested
    in: (a) common stock  of companies not in  the natural resources areas;  (b)
    investment  grade  corporate debt  securities when,  in  the opinion  of the
    Investment Manager, the projected total  return on such securities is  equal
    to  or greater than the expected total  return on equity securities, or when
    such holdings might be  expected to reduce the  volatility of the  portfolio
    (for  purposes  of  this  provision,  the  term  "total  return"  means  the
    difference between the cost  of a security and  the aggregate of its  market
    value  and dividends  received); (c) U.S.  Government securities (securities
    issued or guaranteed as  to principal and interest  by the United States  or
    its  agencies and  instrumentalities); and  (d) in  money market instruments
    under any one or more of the following circumstances: (i) pending investment
    of proceeds of sale of Fund shares or of portfolio securities; (ii)  pending
    settlement  of  purchases  of  portfolio securities;  or  (iii)  to maintain
    liquidity for the purpose of meeting anticipated redemptions.
 
        (4) Notwithstanding  any  of the  foregoing  limitations, the  Fund  may
    invest  more than  35% of  its total assets  in money  market instruments to
    maintain, temporarily, a  "defensive" posture  when, in the  opinion of  the
    Investment  Manager, it is advisable to do  so because of economic or market
    conditions.
 
    The foregoing limitations will apply at the time of acquisition based on the
last determined value  of the relevant  security or other  change in the  Fund's
assets.  Any  subsequent  change  in any  applicable  percentage  resulting from
fluctuations in value  will not  require elimination  of any  security from  the
portfolio.
 
PORTFOLIO MANAGEMENT
 
The  Fund's portfolio is actively managed by  its Investment Manager with a view
to achieving the Fund's investment objective. In determining which securities to
purchase for the Fund  or hold in the  Fund's portfolio, the Investment  Manager
will  rely on information from various sources, including research, analysis and
appraisals of brokers and dealers, including Dean Witter Reynolds Inc.  ("DWR"),
a  broker-dealer affiliate of  the Investment Manager, the  views of Trustees of
the Fund and others  regarding economic developments  and interest rate  trends;
and  the  Investment Manager's  own analysis  of factors  it deems  relevant. No
particular emphasis will be given to  investments in securities for the  purpose
of  earning current  income. The  Fund is  managed within  InterCapital's Growth
Group, which manages  26 equity  funds and fund  portfolios, with  approximately
$10.1 billion in assets as of February 29, 1996. Konrad Krill, Vice President of
InterCapital  and a member of the Growth Group, is the primary portfolio manager
of the Fund. Mr. Krill has been a portfolio manager of the Fund since May,  1994
and  has been the  sole portfolio manager of  the Fund since  April 1995. He has
been a portfolio  manager or investment  analyst at InterCapital  for over  five
years.
 
    Pursuant to an order of the Securities and Exchange Commission, the Fund may
effect  principal transactions in certain money  market instruments with DWR. In
addition, the Fund  may incur  brokerage commissions  on transactions  conducted
through DWR.
 
    Although  the Fund  does not engage  in substantial short-term  trading as a
means of achieving its  investment objective, it  may sell portfolio  securities
without regard to the length of time they have been held, in accordance with the
investment policies described earlier. The Fund will incur underwriting discount
costs  (on underwritten  securities) and  brokerage costs  commensurate with its
portfolio turnover  rate. Short  term  gains and  losses  may result  from  such
portfolio  transactions.  See "Dividends,  Distributions and  Taxes" for  a full
discussion of the tax implications of the Fund's trading policy.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
The investment restrictions listed below  are among the restrictions which  have
been  adopted by the Fund as  fundamental policies. Under the Investment Company
Act of 1940, as  amended (the "Act"),  a fundamental policy  may not be  changed
without the vote of a majority of the outstanding voting securities of the Fund,
as  defined  in the  Act. For  purposes  of the  following limitations:  (i) all
percentage  limitations   apply  immediately   after  a   purchase  or   initial
invest-
 
<PAGE>
ment; and (ii) any subsequent change in any applicable percentage resulting from
market  fluctuations or other  changes in total  or net assets  does not require
elimination of any security from the portfolio.
 
    The Fund may not:
 
        1. Invest  more  than  5% of  the  value  of its  total  assets  in  the
    securities of any one issuer (other than obligations issued or guaranteed by
    the United States Government, its agencies or instrumentalities).
 
        2.  Purchase more than  10% of all outstanding  voting securities or any
    class of securities of any one issuer.
 
        3. Invest more than 25% of the  value of its total assets in  securities
    of  issuers in  any one  industry. This restriction  does not  apply to bank
    obligations or  obligations  issued  or  guaranteed  by  the  United  States
    Government or its agencies or instrumentalities.
 
        4. Invest more than 5% of the value of its total assets in securities of
    issuers  having a  record, together  with predecessors,  of less  than three
    years of  continuous operation.  This  restriction shall  not apply  to  any
    obligation  issued  or  guaranteed  by  the  United  States  Government, its
    agencies or instrumentalities.
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
The Fund  offers its  shares  for sale  to the  public  on a  continuous  basis.
Pursuant   to  a  Distribution  Agreement  between  the  Fund  and  Dean  Witter
Distributors Inc. (the "Distributor"), an  affiliate of the Investment  Manager,
shares  of the Fund  are distributed by  the Distributor and  offered by DWR and
other brokers and dealers who have entered into agreements with the  Distributor
("Selected  Broker-Dealers"). The principal executive  office of the Distributor
is located at Two World Trade Center, New York, New York 10048.
 
    The minimum initial purchase is $1,000. Subsequent purchases of $100 or more
may be  made  by  sending a  check,  payable  to Dean  Witter  Natural  Resource
Development  Securities  Inc.,  directly  to  Dean  Witter  Trust  Company  (the
"Transfer Agent") at P.O. Box  1040, Jersey City, NJ  07303 or by contacting  an
account  executive of DWR  or other Selected  Broker-Dealer. The minimum initial
purchase in  the  case of  investments  through EasyInvest  -SM-,  an  automatic
purchase  plan (see "Shareholder Services"), is $100, provided that the schedule
of automatic investments will  result in investments  totalling at least  $1,000
within  the  first  twelve  months.  In  the  case  of  investments  pursuant to
Systematic Payroll Deduction Plans (including Individual Retirement Plans),  the
Fund,  in its discretion,  may accept investments without  regard to any minimum
amounts which would otherwise be required if the Fund has reason to believe that
additional investments will increase the  investment in each account under  such
Plans  to at least $1,000. Certificates for  shares purchased will not be issued
unless requested by the shareholder in writing to the Transfer Agent.
 
    Shares of  the Fund  are sold  through  the Distributor  on a  normal  three
business day settlement basis; that is, payment is due on the third business day
(settlement  date) after the order is placed with the Distributor. Shares of the
Fund purchased through the  Distributor are entitled  to dividends beginning  on
the  next business day  following settlement date. Since  DWR and other Selected
Broker-Dealers forward investors'  funds on settlement  date, they will  benefit
from  the temporary use  of the funds  if payment is  made prior thereto. Shares
purchased through the Transfer Agent are entitled to dividends beginning on  the
next  business day following receipt of an  order. As noted above, orders placed
directly with the Transfer Agent must be accompanied by payment.
 
    The offering price  will be the  net asset value  per share next  determined
following receipt of an order (see "Determination of Net Asset Value"). While no
sales  charge is imposed at the time shares are purchased, a contingent deferred
sales charge may  be imposed  at the time  of redemption  (see "Redemptions  and
Repurchases"). Sales personnel are compensated for selling shares of the Fund at
the  time of their sale by the  Distributor and/or Selected Dealer. In addition,
some sales personnel of the Selected Broker-Dealer will receive various types of
non-cash compensation as special  sales incentives including trips,  educational
and/or  business seminars and merchandise. The  Fund and the Distributor reserve
the right to reject any purchase orders.
 
PLAN OF DISTRIBUTION
 
The Fund has adopted a  Plan of Distribution, pursuant  to Rule 12b-1 under  the
Act  (the "Plan"), under which the Fund will pay the Distributor a fee, which is
accrued daily and payable monthly, at an  annual rate of 1.0% of the lesser  of:
(a)  the average  daily aggregate  gross sales  of the  Fund's shares  since the
Plan's inception on July  2, 1984 (not including  reinvestments of dividends  or
capital  gains distributions), less the average  daily aggregate net asset value
of the Fund's shares redeemed since the Plan's inception upon which a contingent
deferred sales charge  has been  imposed or waived,  or (b)  the Fund's  average
daily  net assets. This fee is treated by the  Fund as an expense in the year it
is accrued.
 
    Amounts paid under the Plan are paid to the Distributor to compensate it for
the services provided and  the expenses borne by  the Distributor and others  in
the  distribution of the Fund's shares, including the payment of commissions for
sales of the Fund's shares and incentive
com-
 
                                                                               9
<PAGE>
pensation to and expenses of DWR account executives and others who engage in  or
support  distribution of shares  or who service  shareholder accounts, including
overhead and telephone expenses; printing  and distribution of prospectuses  and
reports  used in connection with the offering of the Fund's shares to other than
current shareholders;  and  preparation,  printing  and  distribution  of  sales
literature  and advertising materials. In  addition, the Distributor may utilize
fees  paid  pursuant  to  the  Plan   to  compensate  DWR  and  other   Selected
Broker-Dealers  for  their opportunity  costs in  advancing such  amounts, which
compensation would  be in  the form  of a  carrying charge  on any  unreimbursed
expenses incurred.
 
    For the fiscal year ended February 29, 1996, the Fund accrued payments under
the  Plan amounting to $1,369,150, which amount  is equal to 0.97% of the Fund's
average daily net  assets for the  fiscal year. The  payments accrued under  the
Plan  were calculated pursuant  to clause (a) of  the compensation formula under
the Plan. A  portion of  the fee  payable pursuant to  the Plan,  which may  not
exceed  0.25% of  the Fund's  average daily  net assets,  is characterized  as a
service fee within the meaning of NASD guidelines. The service fee is a  payment
made for personal service and/or maintenance of shareholder accounts.
 
    At any given time, the Distributor may incur expenses in distributing shares
of  the Fund may be in excess of the  total of (i) the payments made by the Fund
pursuant to the Plan and (ii) the proceeds of contingent deferred sales  charges
paid   by  investors  upon  the  redemption   of  shares  (see  "Redemption  and
Repurchases--Contingent Deferred Sales Charge"). For  example, if $1 million  in
expenses  in distributing shares of the Fund  had been incurred and $750,000 had
been received  as described  in (i)  and (ii)  above, the  excess expense  would
amount  to  $250,000.  The Distributor  has  advised  the Fund  that  the excess
distribution expenses, including the  carrying charge described above,  totalled
$5,194,326  at February  29, 1996, which  was equal  to 3.40% of  the Fund's net
assets on such date.
 
    Because there  is no  requirement under  the Plan  that the  Distributor  be
reimbursed  for all expenses or any requirement  that the Plan be continued from
year to year, this excess  amount does not constitute  a liability of the  Fund.
Although  there is no legal obligation for  the Fund to pay expenses incurred in
excess of payments made to  the Distributor under the  Plan and the proceeds  of
contingent  deferred sales charges paid by  investors upon redemption of shares,
if for any reason  the Plan is  terminated the Directors  will consider at  that
time  the  manner  in which  to  treat  such expenses.  Any  cumulative expenses
incurred, but not yet recovered through distribution fees or contingent deferred
sales charges, may or may not  be recovered through future distribution fees  or
contingent deferred sales charges.
 
DETERMINATION OF NET ASSET VALUE
 
The  net asset value per share of the  Fund is determined by taking the value of
all assets of the Fund, subtracting all its liabilities, dividing by the  number
of shares outstanding and adjusting to the nearest cent. The net asset value per
share  of the Fund is determined once daily  at 4:00 p.m., New York time (or, on
days when the New York Stock Exchange closes prior to 4:00 p.m., at such earlier
time), on each day that the New York Stock Exchange is open. The net asset value
per share will not be  determined on Good Friday and  on such other federal  and
non-federal holidays as are observed by the New York Stock Exchange.
 
    In  the calculation of the  Fund's net asset value:  (1) an equity portfolio
security listed or traded on  the New York or  American Stock Exchange or  other
stock  exchange or quoted by  NASDAQ is valued at its  latest sale price on that
exchange or quotation service; if there were no sales that day, the security  is
valued at the latest bid price (in cases where a security is traded on more than
one  exchange, the security is valued on  the exchange designated as the primary
market pursuant  to procedures  adopted by  the Directors),  and (2)  all  other
portfolio  securities for  which over-the-counter market  quotations are readily
available are valued  at the latest  bid price. When  market quotations are  not
readily  available, including circumstances under which  it is determined by the
Investment Manager that sale and bid  prices are not reflective of a  security's
market  value, portfolio securities are valued at their fair value as determined
in good faith under procedures established by and under the general  supervision
of the Fund's Directors.
 
    Short-term  debt securities with remaining maturities  of sixty days or less
are valued  at amortized  cost  unless the  Directors  determine such  does  not
reflect  the securities'  market value, in  which case these  securities will be
valued at their fair value as determined by the Directors.
 
    Certain of  the Fund's  portfolio securities  may be  valued by  an  outside
pricing service approved by the Fund's Trustees. The pricing service may utilize
a  matrix  system incorporating  security quality,  maturity  and coupon  as the
evaluation model parameters, and/or research evaluations by its staff, including
review of broker-dealer market price quotations in determining what it  believes
is  the  fair  valuation of  the  portfolio  securities valued  by  such pricing
service.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
AUTOMATIC INVESTMENT OF DIVIDENDS AND  DISTRIBUTIONS.  All income dividends  and
capital gains distributions are automatically paid in full and fractional shares
of   the  Fund  (or  if  specified   by  the  shareholder,  any  other  open-end
invest-
 
10
<PAGE>
ment company for which InterCapital serves as Investment Manager  (collectively,
with  the Fund, the "Dean Witter  Funds")), unless the shareholder requests that
they be paid in cash. Shares so acquired are not subject to the imposition of  a
contingent  deferred sales  charge upon  their redemption  (see "Redemptions and
Repurchases").
 
INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS RECEIVED IN CASH.  Any shareholder who
receives a cash payment  representing a dividend  or capital gains  distribution
may  invest such dividend or distribution at  the net asset value per share next
determined after receipt  by the Transfer  Agent by returning  the check or  the
proceeds to the Transfer Agent within thirty days after the payment date. Shares
so  acquired are not  subject to the  imposition of a  contingent deferred sales
charge upon their redemption (see "Redemptions and Repurchases").
 
EASYINVEST -SM-.    Shareholders  may  subscribe  to  EasyInvest,  an  automatic
purchase  plan  which  provides  for  any  amount  from  $100  to  $5,000  to be
transferred automatically from a checking or savings account, on a semi-monthly,
monthly or quarterly basis,  to the Transfer Agent  for investment in shares  of
the    Fund   (see   "Purchase   of    Fund   Shares"   and   "Redemptions   and
Repurchases--Involuntary Redemption").
 
SYSTEMATIC WITHDRAWAL  PLAN.   A  systematic  withdrawal plan  (the  "Withdrawal
Plan")  is available  for shareholders  who own or  purchase shares  of the Fund
having a minimum value of $10,000 based  upon the then current net asset  value.
The  Withdrawal Plan provides  for monthly or  quarterly (March, June, September
and December) checks in  any dollar amount,  not less than $25  or in any  whole
percentage  of  the  account balance,  on  an annualized  basis.  Any applicable
contingent deferred sales charge  will be imposed on  shares redeemed under  the
Withdrawal  Plan  (See "Redemptions  and Repurchases--Contingent  Deferred Sales
Charge"). Therefore, any shareholder participating  in the Withdrawal Plan  will
have  sufficient shares redeemed  from his or  her account so  that the proceeds
(net of any applicable contingent deferred sales charge) to the shareholder will
be the designated monthly or quarterly amount.
 
    Shareholders should  contact  their  DWR  or  other  Selected  Broker-Dealer
account executive or the Transfer Agent for further information about any of the
above services.
 
TAX-SHELTERED  RETIREMENT  PLANS.   Retirement plans  are  available for  use by
corporations, the  self-employed, eligible  Individual Retirement  Accounts  and
Custodial  Accounts  under  Section  403(b)(7)  of  the  Internal  Revenue Code.
Adoption of such plans should be on advice of legal counsel or tax adviser.
 
    For further information  regarding plan administration,  custodial fees  and
other  details, investors should contact their account executive or the Transfer
Agent.
 
EXCHANGE PRIVILEGE
 
The Fund makes available  to its shareholders  an "Exchange Privilege"  allowing
the  exchange of shares of  the Fund for shares of  other Dean Witter Funds sold
with a contingent deferred sales charge  ("CDSC funds"), and for shares of  Dean
Witter Short-Term U.S. Treasury Trust, Dean Witter Limited Term Municipal Trust,
Dean  Witter Intermediate Term U.S. Treasury  Trust, Dean Witter Short-Term Bond
Fund, Dean Witter  Balanced Income Fund,  Dean Witter Balanced  Growth Fund  and
five  Dean  Witter Funds  which  are money  market  funds (the  foregoing eleven
non-CDSC funds are hereinafter collectively referred  to in this section as  the
"Exchange  Funds"). Exchanges may be made after  the shares of the Fund acquired
by purchase (not by exchange or dividend reinvestment) have been held for thirty
days. There is no waiting period for exchanges of shares acquired by exchange or
dividend reinvestment.
 
    An exchange to another CDSC  fund or any Exchange Fund  that is not a  money
market  fund is on the basis of the next calculated net asset value per share of
each fund after  the exchange order  is received. When  exchanging into a  money
market  fund from the Fund, shares  of the Fund are redeemed  out of the Fund at
their next calculated  net asset value  and the proceeds  of the redemption  are
used  to  purchase shares  of the  money market  fund at  their net  asset value
determined the following business day.  Subsequent exchanges between any of  the
money  market funds and any of the CDSC funds can be effected on the same basis.
No contingent  deferred sales  charge ("CDSC")  is imposed  at the  time of  any
exchange, although any applicable CDSC will be imposed upon ultimate redemption.
Shares of the Fund acquired in exchange for shares of another CDSC fund having a
different  CDSC schedule  than that  of this  Fund will  be subject  to the CDSC
schedule of this  Fund, even if  such shares are  subsequently re-exchanged  for
shares  of the  CDSC fund  originally purchased. During  the period  of time the
shareholder remains in the  Exchange Fund (calculated from  the last day of  the
month in which the shares were acquired), the holding period (for the purpose of
determining  the rate of the  CDSC) is frozen. If  those shares are subsequently
reexchanged for shares of a CDSC fund, the holding period previously frozen when
the first exchange was made resumes on the last day of the month in which shares
of a CDSC fund are reacquired. Thus, the CDSC is based upon the time (calculated
as described above) the shareholder was invested  in shares of a CDSC fund  (see
"Redemptions  and Repurchases--Contingent  Deferred Sales  Charge"). However, in
the case of shares exchanged for shares  of an Exchange Fund, upon a  redemption
of  shares which results  in a CDSC being  imposed, a credit  (not to exceed the
amount of the CDSC) will be given in an amount equal to the Exchange Fund  12b-1
distribution fees incurred on or after that date which are attributable to those
shares.  (Exchange Fund  12b-1 distribution fees,  if any, are  described in the
prospectus for those funds.)
 
                                                                              11
<PAGE>
    In addition, shares of the  Fund may be acquired  in exchange for shares  of
Dean  Witter Funds sold  with a front-end sales  charge ("front-end sales charge
funds"), but shares  of the  Fund, however acquired,  may not  be exchanged  for
shares  of  front-end sales  charge funds.  Shares  of a  CDSC fund  acquired in
exchange for shares of a front-end sales charge fund (or in exchange for  shares
of  other Dean Witter  Funds for which  shares of a  front-end sales charge fund
have been exchanged) are not subject to any CDSC upon their redemption.
 
    Purchases and  exchanges should  be  made for  investment purposes  only.  A
pattern  of frequent  exchanges may  be deemed by  the Investment  Manager to be
abusive and contrary to the best interests of the Fund's other shareholders and,
at the Investment Manager's discretion, may be limited by the Fund's refusal  to
accept  additional purchases  and/or exchanges  from the  investor. Although the
Fund does not  have any  specific definition of  what constitutes  a pattern  of
frequent  exchanges,  and  will  consider all  relevant  factors  in determining
whether a particular situation is abusive and contrary to the best interests  of
the Fund and its other shareholders, investors should be aware that the Fund and
each  of the other Dean Witter Funds  may in their discretion limit or otherwise
restrict the number  of times this  Exchange Privilege may  be exercised by  any
investor.  Any such restriction will be made  by the Fund on a prospective basis
only, upon notice  to the  shareholder not later  than ten  days following  such
shareholder's most recent exchange.
 
    Also, the Exchange Privilege may be terminated or revised at any time by the
Fund  and/or any of such Dean  Witter Funds for which shares  of the Fund may be
exchanged, upon  such  notice  as  may  be  required  by  applicable  regulatory
agencies.  Shareholders maintaining margin accounts with DWR or another Selected
Broker-Dealer are referred to their account executive regarding restrictions  on
exchange of shares of the Fund pledged in the margin account.
 
    The  current prospectus for each  fund describes its investment objective(s)
and policies, and shareholders should obtain one and examine it carefully before
investing. Exchanges are subject to  the minimum investment requirement and  any
other  conditions imposed by each fund. In the case of any shareholder holding a
share certificate or  certificates, no  exchanges may  be made  until the  share
certificate(s)  have been  received by the  Transfer Agent and  deposited in the
shareholder's account.  An  exchange will  be  treated for  federal  income  tax
purposes  the  same  as a  repurchase  or  redemption of  shares,  on  which the
shareholder may realize a capital gain  or loss. However, the ability to  deduct
capital  losses on an  exchange may be  limited in situations  where there is an
exchange of  shares within  ninety  days after  the  shares are  purchased.  The
Exchange  Privilege is only available in states where an exchange may legally be
made.
 
    If DWR or  another other  Selected Broker-Dealer  is the  current dealer  of
record and its account numbers are part of the account information, shareholders
may  initiate an exchange  of shares of the  Fund for shares of  any of the Dean
Witter Funds (for which  the Exchange Privilege is  available) pursuant to  this
Exchange  Privilege  by contacting  their  DWR or  other  Selected Broker-Dealer
account executive (no Exchange Privilege Authorization Form is required).  Other
shareholders  (and those shareholders who are clients of DWR or another Selected
Broker-Dealer but who wish to make exchanges directly by writing or  telephoning
the  Transfer Agent) must complete and forward to the Transfer Agent an Exchange
Privilege Authorization Form, copies of which may be obtained from the  Transfer
Agent, to initiate an exchange. If the Authorization Form is used, exchanges may
be made by contacting the Transfer Agent at (800) 869-NEWS (toll free).
 
    The  Fund  will  employ  reasonable  procedures  to  confirm  that  exchange
instructions communicated  over  the  telephone  are  genuine.  Such  procedures
include requiring various forms of personal identification such as name, mailing
address,  social security  or other tax  identification number and  DWR or other
Selected Broker-Dealer account number (if any). Telephone instructions will also
be recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent instructions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent between 9:00 a.m.  and 4:00 p.m. New  York time, on any  day the New  York
Stock  Exchange is  open. Any  shareholder wishing to  make an  exchange who has
previously filed an Exchange Privilege Authorization  Form and who is unable  to
reach  the Fund  by telephone should  contact his  or her DWR  or other Selected
Broker-Dealer account  executive, if  appropriate, or  make a  written  exchange
request.  Shareholders are  advised that during  periods of  drastic economic or
market changes, it  is possible that  the telephone exchange  procedures may  be
difficult to implement, although this has not been the case with the Dean Witter
Funds in the past.
 
    Shareholders  should  contact  their  DWR  or  other  Selected Broker-Dealer
account executive  or  the Transfer  Agent  for further  information  about  the
Exchange Privilege.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
REDEMPTION.   Shares of  the Fund can  be redeemed for  cash at any  time at net
asset value per share next determined; however, such redemption proceeds will be
reduced by the amount of any  applicable contingent deferred sales charges  (see
below).  If  shares  are  held  in  a  shareholder's  account  without  a  stock
certificate, a written request for
redemp-
 
12
<PAGE>
tion to the  Fund's Transfer Agent  at P. O.  Box 983, Jersey  City, New  Jersey
07303  is required. If certificates are held  by the shareholder, the shares may
be redeemed  by  surrendering  the  certificates  with  a  written  request  for
redemption along with any additional information required by the Transfer Agent.
 
CONTINGENT  DEFERRED SALES CHARGE.   Shares of  the Fund which  are held for six
years or more after purchase (calculated from the last day of the month in which
the shares were purchased)  will not be subject  to any charge upon  redemption.
Shares redeemed sooner than six years after purchase may, however, be subject to
a  charge upon  redemption. This charge  is called a  "contingent deferred sales
charge" ("CDSC"), which  will be  a percentage of  the dollar  amount of  shares
redeemed  and will be assessed  on an amount equal to  the lesser of the current
market value  or  the cost  of  the shares  being  redeemed. The  size  of  this
percentage  will depend upon how long the shares have been held, as set forth in
the table below:
 
<TABLE>
<CAPTION>
                                             CONTINGENT DEFERRED
               YEAR SINCE                       SALES CHARGE
                PURCHASE                     AS A PERCENTAGE OF
              PAYMENT MADE                     AMOUNT REDEEMED
- -----------------------------------------  -----------------------
<S>                                        <C>
First....................................               5.0%
Second...................................               4.0%
Third....................................               3.0%
Fourth...................................               2.0%
Fifth....................................               2.0%
Sixth....................................               1.0%
Seventh and thereafter...................           None
</TABLE>
 
    A CDSC will not be imposed on:  (i) any amount which represents an  increase
in value of shares purchased within the six years preceding the redemption; (ii)
the current net asset value of shares purchased more than six years prior to the
redemption;  and (iii) the  current net asset value  of shares purchased through
reinvestment of dividends  or distributions and/or  shares acquired in  exchange
for  shares of Dean Witter Funds sold with  a front-end sales charge or of other
Dean Witter Funds acquired in exchange for such shares. Morevoer, in determining
whether a CDSC is applicable it will  be assumed that amounts described in  (i),
(ii)  and (iii) above (in  that order) are redeemed  first. In addition, no CDSC
will be imposed on  redemptions of shares which  were purchased by certain  Unit
Investment  Trusts  (on  which  a  sales charge  has  been  paid)  or  which are
attributable to reinvestment of dividends or distributions from, or the proceeds
of, such Unit Investment Trusts.
 
    In addition, the CDSC, if otherwise  applicable, will be waived in the  case
of:
 
    (1)  redemptions of shares  held at the  time a shareholder  dies or becomes
disabled, only  if the  shares are:  (a) registered  either in  the name  of  an
individual  shareholder (not a trust),  or in the names  of such shareholder and
his or her spouse as joint tenants with right of survivorship; or (b) held in  a
qualified  corporate  or  self-employed retirement  plan,  Individual Retirement
Account ("IRA") or  Custodial Account  under Section 403(b)(7)  of the  Internal
Revenue  Code ("403(b)  Custodial Account"),  provided in  either case  that the
redemption is requested within one year of the death or initial determination of
disability;
 
    (2)  redemptions   in  connection   with  the   following  retirement   plan
distributions: (a) lump-sum or other distributions from a qualified corporate or
self-employed  retirement plan following  retirement (or, in the  case of a "key
employee"  of  a  "top  heavy"  plan,  following  attainment  of  age  59  1/2);
 distributions  from an IRA or 403(b)  Custodial Account following attainment of
age 59 1/2; or (C) a tax-free return of an excess contribution to an IRA; and
 
    (3) all redemptions of  shares held for  the benefit of  a participant in  a
corporate or self-employed retirement plan qualified under Section 401(k) of the
Internal   Revenue  Code  which  offers  investment  companies  managed  by  the
Investment Manager  or its  subsidiary, Dean  Witter Services  Company Inc.,  as
self-directed  investment alternatives and for  which Dean Witter Trust Company,
an affiliate  of  the Investment  Manager,  serves as  recordkeeper  or  Trustee
("Eligible  401(k) Plan"), provided that either: (a) the plan continues to be an
Eligible 401(k)  Plan  after  the  redemption;  or  (b)  the  redemption  is  in
connection  with the complete termination of the plan involving the distribution
of all plan assets to participants.
 
    With reference to (1) above, for the purpose of determining disability,  the
Distributor  utilizes the definition of disability contained in Section 72(m)(7)
of the  Internal Revenue  Code, which  relates  to the  inability to  engage  in
gainful  employment. With reference  to (2) above,  the term "distribution" does
not encompass a direct transfer of  IRA, 403(b) Custodial Account or  retirement
plan  assets to a  successor custodian or  trustee. All waivers  will be granted
only following receipt by the  Distributor of confirmation of the  shareholder's
entitlement.
 
REPURCHASE.   DWR and other Selected Broker-Dealers are authorized to repurchase
shares represented by  a stock certificate  which is delivered  to any of  their
offices.  Shares held in a shareholder's account without a stock certificate may
also be repurchased by DWR and other Selected Broker-Dealers upon the telephonic
request of the  shareholder. The  repurchase price is  the net  asset value  per
share,  next determined  (see "Purchase of  Fund Shares")  after such repurchase
order is  received  by DWR  or  other  Selected Broker-Dealer,  reduced  by  any
applicable CDSC.
 
    The  CDSC, if any, will be the only fee imposed upon repurchase by the Fund,
the Distributor, DWR  or other Selected  Broker-Dealers. The offers  by DWR  and
other  Selected  Broker-Dealers to  repurchase shares  may be  suspended without
notice by them at any time. In that event, shareholders may redeem their  shares
through the Fund's Transfer Agent as set forth above under "Redemption."
 
PAYMENT  FOR SHARES REDEEMED  OR REPURCHASED.  Payment  for shares presented for
repurchase or redemption will be made  by check within seven days after  receipt
by   the  Transfer   Agent  of  the   certificate  and/or   written  request  in
 
                                                                              13
<PAGE>
good order. Such payment may be  postponed or the right of redemption  suspended
under unusual circumstances, e.g. when normal trading is not taking place on the
New  York  Stock Exchange.  If  the shares  to  be redeemed  have  recently been
purchased by check, payment  of the redemption proceeds  may be delayed for  the
minimum  time  needed to  verify that  the  check used  for investment  has been
honored (not more than fifteen days from the time of receipt of the check by the
Transfer Agent). Shareholders  maintaining margin accounts  with DWR or  another
Selected  Broker-Dealer  are  referred  to  their  account  executive  regarding
restrictions on redemption of shares of the Fund pledged in the margin account.
 
REINSTATEMENT PRIVILEGE.  A shareholder who  has had his or her shares  redeemed
or  repurchased and  has not  previously exercised  this reinstatement privilege
may, within  thirty  days  after  the date  of  the  redemption  or  repurchase,
reinstate any portion or all of the proceeds of such redemption or repurchase in
shares  of the Fund at the net asset value next determined after a reinstatement
request, together with proceeds, is received by the Transfer Agent and receive a
pro rata  credit  for  any CDSC  paid  in  connection with  such  redemption  or
repurchase.
 
INVOLUNTARY  REDEMPTION.  The Fund  reserves the right on  sixty days' notice to
redeem at  their net  asset value,  the shares  of any  shareholder (other  than
shares  held  in an  Individual Retirement  Account  or Custodial  Account under
Section 403(b)(7) of  the Internal Revenue  Code) whose shares  have a value  of
less  than $100, or  such lesser amount as  may be fixed by  the Fund's Board of
Directors or, in  the case  of an account  opened through  EasyInvest, if  after
twelve  months the  shareholder has  invested less  than $1,000  in the account.
However, before  the Fund  redeems such  shares and  sends the  proceeds to  the
shareholder, it will notify the shareholder that the value of the shares is less
than  the  applicable amount  and allow  the shareholder  to make  an additional
investment in an amount which will increase the value of the account to at least
the applicable  amount before  the  redemption is  processed.  No CDSC  will  be
imposed on any involuntary redemption.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
DIVIDENDS  AND  DISTRIBUTIONS.    The  Fund  intends  to  pay  dividends  and to
distribute substantially  all  of  the  Fund's net  investment  income  and  net
short-term  capital  gains, if  any,  at least  once  each year.  The  Fund may,
however, determine either  to distribute or  to retain  all or part  of any  net
long-term capital gains in any year for reinvestment.
 
    All dividends and any capital gains distributions will be paid in additional
Fund  shares (without  sales charge) and  will be automatically  credited to the
shareholder's account  without  issuance  of  a  stock  certificate  unless  the
shareholder  requests  in  writing that  all  dividends  be paid  in  cash. (See
"Shareholder Services--Automatic Investment of Dividends and Distributions".)
 
TAXES.  Because the Fund intends to distribute all of its net investment  income
and  net short-term capital gains to shareholders and otherwise remain qualified
as a regulated  investment company under  Subchapter M of  the Internal  Revenue
Code  of 1986,  it is not  expected that  the Fund will  be required  to pay any
federal income  tax on  such  income and  capital  gains. Shareholders  who  are
required  to pay taxes on their income  will normally have to pay Federal income
taxes, and any state  income taxes and/or local  income taxes, on the  dividends
and  distributions they receive from the Fund. Such dividends and distributions,
to the extent that they are derived from net investment income or net short-term
capital gains,  are  taxable to  the  shareholder as  ordinary  dividend  income
regardless  of whether the shareholder receives such distributions in additional
shares or in cash.
 
    As a regulated investment company, the  Fund is subject to the  requirements
that  less than 30%  of the Fund's gross  income be derived  from gains from the
sale or other disposition  of securities held for  less than three months.  This
requirement  may  limit the  Fund's  ability to  engage  in options  and futures
transactions.
 
    After the end  of the year,  shareholders will receive  full information  on
their dividends and capital gains distributions for tax purposes. To avoid being
subject  to a 31%  Federal backup withholding tax  on taxable dividends, capital
gains  distributions   and  the   proceeds  of   redemptions  and   repurchases,
shareholders' taxpayer identification numbers must be furnished and certified as
to their accuracy.
 
    Distributions  of  net  long-term  capital gains,  if  any,  are  taxable to
shareholders as long-term capital gains regardless of how long a shareholder has
held the Fund's shares and regardless of whether the distribution is received in
additional shares or in cash. Capital  gains distributions are not eligible  for
the dividends received deduction.
 
    Shareholders  should consult their  tax advisers as  to the applicability of
the foregoing to their current situation.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
From time to time the  Fund may quote its  "total return" in advertisements  and
sales  literature. The total return of the  Fund is based on historical earnings
and is not intended  to indicate future performance.  The "average annual  total
 
14
<PAGE>
return"  of  the  Fund refers  to  a  figure reflecting  the  average annualized
percentage increase (or decrease) in the  value of an initial investment in  the
Fund  of $1,000 over  periods of one,  five and ten  years. Average annual total
return reflects all income earned by the Fund, any appreciation or  depreciation
of  the Fund's assets, all  expenses incurred by the  Fund and all sales charges
which would be incurred  by redeeming shareholders, for  the stated periods.  It
also assumes reinvestment of all dividends and distributions paid by the Fund.
 
    In  addition to the foregoing, the Fund  may advertise its total return over
different periods of time by means of aggregate, average, year-by-year or  other
types  of total  return figures.  Such calculations may  or may  not reflect the
deduction of the  contingent deferred  sales charge which,  if reflected,  would
reduce  the  performance  quoted. The  Fund  may  also advertise  the  growth of
hypothetical investments of $10,000, $50,000 and $100,000 in shares of the Fund.
The Fund  from time  to time  may  also advertise  its performance  relative  to
certain  performance rankings and indexes  compiled by independent organizations
(such as mutual fund performance rankings of Lipper Analytical Services, Inc.).
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
VOTING RIGHTS.  All shares  of common stock of the  Fund are of $0.01 par  value
and  are  equal as  to  earnings, assets  and  voting privileges.  There  are no
conversion,  pre-emptive  or  other  subscription   rights.  In  the  event   of
liquidation,  each share of common stock of  the Fund is entitled to its portion
of all of the  Fund's assets after  all debts and expenses  have been paid.  The
shares do not have cumulative voting rights.
 
    Under  ordinary circumstances, the Fund is not required, nor does it intend,
to hold Annual Meetings of Stockholders. The Directors may call Special Meetings
of Stockholders for action by stockholder vote as may be required by the Act  or
the Fund's By-Laws.
 
CODE  OF ETHICS.  Directors, officers and employees of InterCapital, Dean Witter
Services Company Inc. and the Distributor are subject to a strict Code of Ethics
adopted by those companies. The  Code of Ethics is  intended to ensure that  the
interests  of shareholders  and other clients  are placed ahead  of any personal
interest, that no undue personal benefit is obtained from a person's  employment
activities  and that actual and potential  conflicts of interest are avoided. To
achieve these goals and comply with regulatory requirements, the Code of  Ethics
requires, among other things, that personal securities transactions by employees
of  the companies be subject to an  advance clearance process to monitor that no
Dean Witter Fund is engaged at the same  time in a purchase or sale of the  same
security.  The Code  of Ethics  bans the  purchase of  securities in  an initial
public offering, and also prohibits engaging in futures and options transactions
and profiting on short-term  trading (that is,  a purchase within  60 days of  a
sale  or  a sale  within 60  days of  a  purchase) of  a security.  In addition,
investment personnel may  not purchase  or sell  a security  for their  personal
account  within 30 days before or after  any transaction in any Dean Witter Fund
managed by them. Any violations of the Code of Ethics are subject to  sanctions,
including  reprimand, demotion or  suspension or termination  of employment. The
Code of Ethics comports with regulatory requirements and the recommendations  in
the  1994 report by the Investment  Company Institute Advisory Group on Personal
Investing.
 
SHAREHOLDER INQUIRIES.  All inquiries regarding  the Fund should be directed  to
the  Fund at the  telephone numbers or address  set forth on  the front cover of
this Prospectus.
 
                                                                              15
<PAGE>
 
DEAN WITTER
NATURAL RESOURCE DEVELOPMENT
SECURITIES INC.
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
BOARD OF DIRECTORS
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Paul Kolton
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
 
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive
Officer
Sheldon Curtis
Vice President, Secretary and
General Counsel
Konrad Krill
Vice President
Thomas F. Caloia
Treasurer
 
CUSTODIAN
The Bank of New York
90 Washington Street
New York, New York 10286
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
Dean Witter Trust Company
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
 
INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
 
INVESTMENT MANAGER
Dean Witter InterCapital Inc.


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