MAGMA COPPER CO
S-3, 1994-03-29
PRIMARY SMELTING & REFINING OF NONFERROUS METALS
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  As filed with the Securities and Exchange Commission on March 29, 1994
                                                   Registration No. ________
============================================================================

                     SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C. 20549
                             __________________
                                  FORM S-3
                        REGISTRATION STATEMENT UNDER
                         THE SECURITIES ACT OF 1933
                               ______________
                            MAGMA COPPER COMPANY
           (Exact name of registrant as specified in its charter)

     Delaware                                                  86-0219794
     (State or other jurisdiction of                        (I.R.S. employer
     incorporation or organization)                             I.D. number)

                           7400 North Oracle Road
                                  Suite 200
                            Tucson, Arizona 85704
                               (602) 575-5600

    (Address, including zip code, and telephone number, including area code,
                of registrant's principal executive offices)

                              Douglas J. Purdom
                           Chief Financial Officer
                            Magma Copper Company
                           7400 North Oracle Road
                                  Suite 200
                            Tucson, Arizona 85704
                               (602) 575-5600
          (Name, address, including zip code, and telephone number,
                  including area code, of agent for service)

                          _________________________

    The Commission is requested to send copies of all communications to:

                              Steven D. Pidgeon
                             Streich Lang, P.A.
                   100 West Washington Street, Suite 2100
                         Phoenix, Arizona 85003-1897
                               (602) 229-5502

      Approximate date of commencement of proposed sale to the public:
 From time to time after the effective date of this Registration Statement.
                           ______________________

     If the only securities being registered on this Form are being  offered
pursuant  to dividend  or  interest  reinvestment  plans, please  check  the
following box.  [ ]

                            _____________________

     If  any  of the  securities being  registered on  this  Form are  to be
offered  on a  delayed or continuous  basis pursuant  to Rule  415 under the
Securities Act of  1933, other  than securities offered  only in  connection
with  dividend or interest  reinvestment plans,  please check  the following
box.  [X]
                            _____________________

                       CALCULATION OF REGISTRATION FEE


============================================================================
                     |           |  Proposed |                |
                     |           |  Maximum  |                |
                     |           |  Offering |    Proposed    |
      Title of       |           | Price Per |    Maximum     |   Amount of
 Class of Securities | Amount to | Share (2) |   Aggregate    | Registration
  to be Registered   |     be    |           | Offering Price |      Fee
         (1)         | Registered|           |                |
- ----------------------------------------------------------------------------
Common Stock, $0.01  | 3,320,600 |  $16.071  | $53,365,362.60 |  $18,401.82
par value            |  Shares   |           |                |
============================================================================

(1)  This registration statement  covers (i) the issuance by the  Registrant
of 1,000,000 shares of Common  Stock (which may be subject to  adjustment in
certain  events) upon exercise of  an equal number  of Common Stock Purchase
Warrants (the "Class  B Warrants"), (ii) the  resale by the  current holders
(the "Selling Securityholders")  of shares of  Common Stock acquired  by the
Selling Securityholders upon exercise of the Class B Warrants, and (iii) the
resale  by one of the Selling  Securityholders of 2,320,600 shares of Common
Stock previously acquired by such Selling Securityholder.

(2)  Estimated solely for purposes of calculating the registration fee.
                         ___________________________

     The Registrant hereby amends  this Registration Statement on such  date
or  dates  as  may  be  necessary to  delay  its  effective  date  until the
Registrant shall file  a further  amendment which  specifically states  that
this Registration Statement shall  thereafter become effective in accordance
with Section 8(a) of the  Securities Act of 1933 or until  this Registration
Statement  shall become  effective on  such date  as the  Commission, acting
pursuant to said Section 8(a), may determine.

INFORMATION  CONTAINED  HEREIN IS  SUBJECT  TO COMPLETION  OR  AMENDMENT.  A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES  HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION.  THESE  SECURITIES MAY  NOT BE SOLD  NOR
MAY OFFERS TO BUY BE ACCEPTED  PRIOR TO THE TIME THE  REGISTRATION STATEMENT
BECOMES EFFECTIVE.  THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
THE SOLICITATION  OF AN OFFER  TO BUY NOR  SHALL THERE  BE ANY SALE OF THESE
SECURITIES IN ANY STATE  IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD  BE
UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF
ANY SUCH STATE.



               SUBJECT TO COMPLETION, DATED MARCH 29, 1994

PROSPECTUS

                                Common Stock

                            MAGMA COPPER COMPANY

     This  Prospectus  relates  to  the issuance  by  Magma  Copper  Company
("Magma" or  the "Company") of 1,000,000  shares of Common Stock,  $0.01 par
value per share (the "Common Stock"), upon the  exercise of 1,000,000 Common
Stock Purchase Warrants  of the Company  (the "Class B  Warrants") that  are
currently  outstanding.   Each Class  B Warrant is  exercisable at  any time
prior to November  30, 1995 to purchase one share of  Common Stock for $8.50
per share, subject to adjustment  in certain events.  As of the date hereof,
the  Class  B Warrants  are  held of  record by  three  securityholders (the
"Selling Securityholders").  This  Prospectus also relates to the  resale by
the Selling Securityholders  of any shares of Common  Stock they may acquire
upon  exercise of  the Class  B Warrants  and to  the resale  by one  of the
Selling  Securityholders  of 2,320,600  additional  shares  of Common  Stock
previously acquired by such Selling Securityholder.

     The Company's Common Stock  is  listed  on  the New York Stock Exchange
("NYSE") (Symbol: "MCU").  On  March 25,  1994,  the  closing  price  of the
Common Stock, as reported on the NYSE, was  $15-7/8  per  share.  Any Common
Stock offered will be  listed,  subject  to  notice  of  issuance,  on  such
exchange.

     The Selling Securityholders may sell the Common Stock from time to time
in underwritten public offerings, in transactions pursuant to Rule 144 under
the Securities Act of 1933, as amended (the "Securities Act"), in  privately
negotiated transactions, through  the facilities of the NYSE,  or otherwise,
at market prices prevailing at the time  of sale, at prices relating to such
prevailing market  prices, or at  negotiated prices.   The Company  will not
receive any  of the proceeds from  the sale of  Common Stock by  the Selling
Securityholders.   All expenses in  connection with the  registration of the
securities, other than any  underwriting or brokerage discounts, commissions
and selling  expenses with respect to Common Stock being sold by the Selling
Securityholders, will be  borne by the Company.  See  "Plan of Distribution"
and "Selling Securityholders."



          For  a  discussion of  certain  factors  that should  be
          considered  by  prospective  investors, see  "Investment
          Considerations."




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


              The date of this Prospectus is ____________, 1994


                            AVAILABLE INFORMATION

     Magma  is subject to  the informational requirements  of the Securities
Exchange Act  of 1934, as  amended (the "Exchange  Act"), and  in accordance
therewith  files reports,  proxy statements  and other information  with the
Securities and Exchange  Commission (the "Commission").   The reports, proxy
statements  and other information filed by Magma  with the Commission can be
inspected and copied at the Commission at Room 1024, 450 Fifth Street, N.W.,
Washington,  D.C.  20549,  and at  the  following  regional  offices of  the
Commission:  7 World Trade Center, 13th Floor,  New York, New York 10007 and
Northwestern Atrium  Center, 500 West  Madison Street, Suite  1400, Chicago,
Illinois 60661.   Copies of such information can be obtained from the Public
Reference Section  of the  Commission, 450  Fifth Street, N.W.,  Washington,
D.C. 20549, at prescribed rates.  The Common Stock is listed on the New York
Stock Exchange  and similar information  can be inspected and  copied at the
NYSE, 20 Broad Street, 17th Floor, New York, New York 10005.

     This  Prospectus constitutes a part of a registration statement on Form
S-3  (the "Registration Statement") filed by the Company with the Commission
under  the Securities Act  of 1933,  as amended  (the "Securities  Act"). As
permitted  by the rules and  regulations of the  Commission, this Prospectus
omits certain of the information contained in the Registration Statement and
reference  is hereby made to the Registration Statement and related exhibits
for  further  information with  respect to  the  Company and  the securities
offered hereby.   Statements contained herein  concerning the provisions  of
any documents filed as an exhibit to the Registration Statement or otherwise
filed with the Commission are not necessarily complete, and in each instance
reference is  made  to the  copy  of such  document  so filed.    Each  such
statement is qualified in its entirety by such reference.

               INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The  following documents have been  filed by Magma  with the Commission
and  are  hereby incorporated  by reference into this Prospectus: (i) Annual
Report  on Form  10-K for  the fiscal  year ended December 31, 1993, as well
as  those  portions  of  the  Proxy  Statement  for  1993  Annual Meeting of
Stockholders that are expressly incorporated by reference therein,  and (ii)
the  description  of  the  Common  Stock contained in the Company's Form 8-A
filed on October 22, 1992. All other documents and reports filed pursuant to
Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act from the date of this
Prospectus and prior to the  termination of  the offering of  the securities
shall be  deemed to be incorporated by  reference herein and shall be deemed
to  be  a  part  hereof  from  the  date  of  the filing of such reports and
documents.

     Any  statement contained  in a  document incorporated  or deemed  to be
incorporated  by  reference  herein  shall  be  deemed  to  be  modified  or
superseded for  purposes of this Prospectus  to the extent that  a statement
contained herein or  in any subsequently filed document which  also is or is
deemed  to be incorporated by  reference herein modifies  or supersedes such
statement. Any such statement so modified or superseded shall not be deemed,
except  as  so  modified  or  superseded,  to  constitute  a  part  of  this
Prospectus.

     The Company will  provide without charge to each person  to whom a copy
of this  Prospectus is delivered, on written or oral request of such person,
a copy  of any or all  documents which are incorporated  herein by reference
(not  including the  exhibits to  such documents,  unless such  exhibits are
specifically incorporated by reference in the document which this Prospectus
incorporates).    Requests  should   be  directed  to  Mr. Richard  Johnson,
Assistant Treasurer, at the Company's principal executive offices located at
7400 North Oracle Road,  Suite 200, Tucson, Arizona 85704,  telephone number
(602) 575-5600.
                                 THE COMPANY

     Magma is a fully  integrated producer of electrolytic copper  and ranks
among the largest  U.S. copper  producers.  Magma's  principal products  are
high quality copper cathode and high quality copper rod, the latter of which
is the basic feedstock of the copper wire and cable industry.

     The  Company  owns and  operates underground  copper  mines at  its San
Manuel  and  Superior Mining  Divisions, open-pit  copper  mines at  its San
Manuel and Pinto Valley Mining Divisions, and in situ leaching operations at
its  San Manuel  and  Pinto Valley  Mining  Divisions, all  in  southeastern
Arizona.

     Magma operates the largest and most modern copper smelting and refining
complex  in the  United States  through its  wholly owned  subsidiary, Magma
Metals Company.  The smelter has a rated production capacity of 1.25 million
tons of  copper concentrate per  year, which  represents up to  25% of  U.S.
smelting and  refining capacity.  In  addition to smelting and  refining its
own  copper  concentrate  production,  the  Company  smelts  and  refines  a
substantial  amount of  copper  concentrates  on  a  custom  basis  for,  or
purchased from, third parties,  the profits from which reduce  the Company's
overall break-even cost of producing copper.

     Magma  was  a wholly  owned  subsidiary of  Newmont  Mining Corporation
("Newmont") from 1969  until March  1987, and remained  under its  influence
until  November   1988,  when   Magma  undertook  a   recapitalization  (the
"Recapitalization") in  which  it  purchased all  of  the  remaining  equity
interests held by Newmont.

Recent Operating Performance

     Since the Recapitalization, the  Company has substantially improved its
operating performance.  The Company has increased copper production from its
own sources  by approximately  40% from  402 million pounds  in 1988  to 563
million  pounds in 1993.   Production from the  leaching, solvent extraction
and electrowinning  ("SX-EW") operations  increased by  87% from 86  million
pounds in 1988 to 161 million pounds  in 1993.  The Company's total smelting
and  refining production has increased by approximately 48% from 414 million
pounds  of copper in 1988 to 615 million pounds in 1993.  Net cash operating
costs of copper  sold have decreased from $.78 per  pound ($.93 adjusted for
inflation) in 1988 to $.66 per pound in 1992.   In 1993, despite the effects
of extraordinary rains and flooding early in the year, the  Company was able
to  maintain the $.66 per pound  cost level that had  been achieved in 1992.
Further, as a result  of intensified cost reduction efforts,  cash operating
costs decreased to $.63 per pound in the third quarter and $.61 per pound in
the fourth  quarter of 1993.   Net cash operating costs  per pound represent
(a)  operating costs of  Magma source  copper sold  (excluding depreciation,
depletion and  amortization) reduced by credits for  by-products and profits
from  custom processing divided by (b) total pounds sold from Magma sources.
The  Company  attributes  its  increased  production  and  productivity  and
reduction in operating  costs primarily to  improved labor relations,  which
culminated  in  the execution  in 1991  of  a 15-year  collective bargaining
agreement,  as well as the use of innovative operating technology, including
an increase in production from lower cost SX-EW technology.

     During  1993,  the  Company's  operations were  adversely  affected  by
extraordinary rainfall conditions, lower copper prices (which were partially
offset by hedging  activities) and other factors.  As  a result, total sales
and net income were $792.4 million and $21.9 million, respectively,  for the
year  ended December 31, 1993, compared to $819.5 million and $55.3 million,
respectively, for the year ended December  31, 1992.  The Company  estimates
that the extraordinary  rainfalls reduced net income by  approximately $15.5
million during the first six months of  1993.  Although the Company is still
in  the process  of  repairing,  upgrading  and  expanding  certain  of  its
facilities that were damaged by the rainfalls, operations that were affected
by the rainfalls returned to normal in the second half of 1993.

     The Company's operations  are highly dependent on copper prices.   As a
hedge against lower copper prices, the Company purchased  put options on the
London  Metal  Exchange  ("LME")  covering  511.5  million  pounds  of  1993
production at an exercise price of $.95 per pound.  During the second, third
and  fourth  quarters  of  1993,  the  Company  exercised  option  contracts
totalling 384 million  pounds.  Largely as a result  of these options, Magma
was  able to achieve an average realized price per pound of $.94 in 1993, as
compared to  an average  LME price of  $.87 per  pound.   For the first  and
second  quarters of  1994, the  Company has  purchased put  option contracts
covering  287 million  pounds of  production, providing  a minimum  realized
price of $.72 per pound on a LME basis. For the third and fourth quarters of
1994,  the  Company  has  entered  into  LME  futures contracts covering 121
million  pounds  of  production  at  an  average price of $.82 per pound and
purchased  put  option  contracts  covering 176 million pounds of production
that provide a minimum realized price  of $.74 per pound on a LME basis. The
Company has  also  purchased  put  option  contracts  covering  374  million
pounds  of its production during the first three quarters of  1995 providing
a minimum realized price of $.74  per pound on  a LME basis.   Coupled  with
expected reductions in cash  operating  costs, the Company believes that the
protection  afforded by the options should result in positive cash flow from
operations during  1994.    In  addition to its hedging program, the Company
has accelerated measures designed to reduce its cash operating costs, with a
view  to  maintaining  sufficient cash  balances,  cash  flow and  borrowing
capacity necessary to fund selected development projects.

Development Opportunities

     The Company  is  currently pursuing  or evaluating  several major  mine
development  opportunities, as  well  as an  expansion  and upgrade  to  its
smelting and refining complex.

     Robinson Mining District.  In  1991, the Company completed a  series of
transactions in which it acquired the Robinson Mining  District ("Robinson")
near Ely, Nevada, for an aggregate cost of approximately $58 million.  Based
upon  drill and assay  results, the Company  believes that  Robinson has 252
million tons of proven/probable  sulfide ore reserves with an  average grade
of .553% copper  and .0102 ounces  of gold per ton,  and 57 million  tons of
gold oxide ore  reserves with an average  grade of .0086 ounces of  gold per
ton.   The Company estimates  that Robinson could  produce approximately 135
million  pounds of copper annually for 16 years through traditional methods.
In addition, these studies  estimate that Robinson could produce  an average
of 97,300 ounces of gold and  390,000 ounces of silver annually from sulfide
copper  ore and  17,500 ounces  of gold  per  year from  leaching operations
during this time period.  The Company  is conducting a further study of this
property  to determine  the  opportunity to  increase  production and  lower
costs,  which  may  require  greater  capital  investment.   Development  of
Robinson  requires,  among  other  factors,  appropriate  environmental  and
operating  permits.  In early 1993, the Bureau of Land Management determined
that an Environmental Impact  Statement ("EIS") must be prepared  to analyze
the Company's proposed re-development of the property.  The Company believes
the EIS process  will be completed during 1994 and  production will begin in
the  first  quarter of  1996, although  there can  be  no assurance  in this
regard.

     Kalamazoo.   The  Company's Kalamazoo  orebody, which  is near  its San
Manual underground  mine, is comprised of  two levels, an upper  level which
consists of  approximately 33 million  tons of proven/probable  ore reserves
and  a  lower  level  which  contains  approximately  186  million  tons  of
proven/probable  ore  reserves.   In  March  1993,  the  Company's Board  of
Directors approved  funding  for  the  development of  the  lower  Kalamazoo
orebody.   Based  on the  current mine  plan, this  project is  scheduled to
produce 2.13 billion pounds of copper during the period from 1996 to 2009.

     Florence.   In July  1992, the Company  completed the acquisition  of a
large copper deposit near Florence, Arizona.  The Company's project team has
begun a pre-feasibility study  to determine the opportunity  for the use  of
SX-EW leaching technology at this deposit.

     Smelting  and  Refining Complex.    The Company  is  in the  process of
expanding and upgrading its smelting and refining complex.  During 1993, the
smelter produced 681 million  pounds of copper in anode  form, significantly
in excess of its  design capacity of 600 million pounds.  The expansion will
increase design  capacity to 720 million  pounds per year.   The increase in
design capacity,  scheduled to be  completed in the second  quarter of 1994,
should enable the Company to maintain its custom smelting business even with
the expected increase in smelting from Magma source copper when the Robinson
Mining  District begins production.  In addition, the smelter project, which
includes the addition  of a new, large acid plant,  will further improve the
smelter's environmental performance.

     Capital Requirements.   Based on present  estimates development of  the
Robinson  Mining District could require capital expenditures on the order of
approximately  $300   million   for  traditional   concentrate   production,
development   of  the   lower  Kalamazoo   orebody  could   require  capital
expenditures of  approximately $140 million  and expansion of  the Company's
smelting and refining complex is expected to require capital expenditures of
approximately $85  million, for an aggregate of  approximately $500 million.
Of this amount,  $105 million had been expended toward  these projects as of
December  31, 1993, $90 million  is expected to be expended  in 1994 and the
remainder is expected to  be spent over the next four  years.  The foregoing
estimates  are  subject  to change.    The  Company  has  not yet  made  any
determination of the cost to develop the Florence property.

     The Company intends  to finance  any projects that  it undertakes  with
internal  cash flow, cash  reserves and additional  financings if necessary.
The completion or success of these projects or, in some  cases, the decision
to undertake  them is subject to a number of factors, including the price of
copper  and,  where appropriate,  the  completion  of favorable  feasibility
studies, permitting and other factors.  Many of these factors are outside of
the Company's  control.   There can  be no assurance  that the  Company will
undertake all of these opportunities or that, if undertaken, they will prove
successful.   If the Company is unable to replace its reserves from the mine
development  projects being  pursued or  evaluated, or  with other  reserves
identified or acquired in  the future, the Company's dependence  upon third-
party  sources to  supply copper  concentrate to  its smelting  and refining
operations would increase.

Refinancings and Related Matters

     In the  past three years, the Company has taken a number of significant
actions in  an effort  to enhance  its financial  position on a  prospective
basis, including the following.

     Debt  Refinancing.    Through  a  series  of  new  debt  offerings  and
redemptions  of   previously  outstanding  indebtedness,  the   Company  has
refinanced almost all  of its outstanding public  indebtedness, reducing the
weighted average interest rate on its  outstanding debt from 14.1% to 10.7%.
The refinancings resulted in a $9.7 million decrease in net interest expense
in 1992  over 1991, which was partially offset by a $3 million extraordinary
loss related to premiums paid on early debt repayments.

     In May 1993, the Company established a $200 million unsecured revolving
credit facility.  The facility has a five-year term and matures in May 1998.
The loan agreement evidencing the facility limits the ability of the Company
and its subsidiaries  to encumber their  assets and property, to  enter into
sale and leaseback transactions, to enter into mergers and consolidations or
to  sell all  or substantially  all of  their assets (or  certain identified
assets), and  to repurchase  or redeem subordinated  indebtedness, including
Senior Subordinated Debt Securities and Subordinated Debt Securities, except
in certain circumstances.  The loan agreement also limits  the incurrence of
indebtedness  by the Company's  subsidiaries, requires that  the Company and
its subsidiaries maintain a minimum consolidated net worth, and  establishes
a maximum ratio of  debt to capitalization and  a minimum interest  coverage
ratio.  As of March 15, 1994, there were no outstanding borrowings under the
revolving  credit facility.  Any  borrowings under the  credit facility will
constitute  Senior  Indebtedness  with  respect  to  each  series of  Senior
Subordinated Securities and Subordinated Securities, and will rank senior in
right of payment thereto.

     Enhanced Capital Base.  During 1993, the Company raised $200 million of
additional  equity  through two convertible preferred stock offerings.  In a
public offering  completed in  July 1993, the Company issued $100 million of
convertible  preferred stock  that carries a 5-5/8% cumulative  dividend. In
December 1993, the Company  completed a public offering  of $100 million  of
convertible preferred stock that carries a 6% cumulative dividend.

     In December 1992, the  Company conducted an exchange offer  under which
all of  its then outstanding  Series B  Cumulative Convertible  Exchangeable
Preferred  Stock was  exchanged  for Common  Stock.   This  preferred  stock
carried a cumulative  dividend obligation in excess of $9  million per year,
which would have been payable solely in cash beginning in November 1993.

     In  October  1992,  the  Company's  stockholders  voted  to  amend  the
Company's  Certificate  of  Incorporation   to  eliminate  the  dual  class,
disparate voting  rights structure of its Common Stock.  The Company now has
one class of Common Stock, $.01 par value per share.

     Accounting  Adjustments.  At the  end of 1991,  the Company implemented
various accounting adjustments in conjunction with the reorganization of the
Company into  distinct profit centers.   Although these  adjustments reduced
stockholders' equity and  lowered prior  earnings, they did  not impact  the
Company's cash position or cash flow.


                          INVESTMENT CONSIDERATIONS

     Copper Price Volatility.  The profitability of the Company's operations
is largely dependent upon the worldwide market price for copper.  A one cent
per pound change in the average price received for the Company's 1993 output
would  have  affected  earnings  before interest,  taxes,  depreciation  and
amortization  by an estimated $5.6 million.  Copper prices have historically
been  subject  to wide  fluctuations and  are  affected by  numerous factors
beyond  the control  of the  Company, including  international economic  and
political conditions, levels of supply and demand, the availability and cost
of  copper substitutes, inventory levels maintained  by copper producers and
others and, to a lesser degree, inventory carrying costs (primarily interest
charges) and international exchange  rates.  From time  to time the  Company
engages in hedging  activities in an effort to stabilize  the Company's cash
flow in  the event of declining  copper prices.  Depending  upon the hedging
program employed,  market conditions  and other factors,  hedging activities
could reduce the cash flow which the Company would otherwise realize.

     Competition.   Certain  foreign and  domestic copper  producers benefit
from higher-grade orebodies than those owned by  the Company.  Further, most
foreign  producers  benefit  from  lower  labor  rates  and  less  stringent
environmental  regulation  than  United  States  producers.    Many  foreign
producers maintain maximum production to meet  government-imposed employment
and  foreign  exchange  revenue  goals,  sometimes  without  regard  to  the
condition of  the world copper market  or the profitability of  their mining
operations.   The  Company  and other  copper  producers also  compete  with
manufacturers of  other  materials,  including  aluminum,  stainless  steel,
plastics  and fiber  optic cables.   Should copper  prices increase,  use of
these alternative materials may also increase.

     Environmental Regulation.  The mining and mineral processing industries
are  subject to extensive regulations for the protection of the environment,
including regulations relating to air  and water quality, mine  reclamation,
remediation,  solid  and  hazardous  waste  handling  and  disposal  and the
promotion of  occupational safety.  From  time to time the  Company is cited
for  noncompliance  with  applicable  environmental  laws  and  regulations.
However,  the Company believes that  it is currently  in material compliance
with  these laws  and regulations  and  it is  not aware  of any  identified
violation or potential violation  that is likely to have  a material adverse
effect  on  its results  of operations.    Future regulations  or regulatory
interpretations  could  require  the  Company   to  modify  or  curtail  its
operations or  incur  substantial additional  expense. In  this regard,  the
Company cannot  predict, at this  time, the level of  new emissions controls
and related  costs which  may be  required for it  to comply  with standards
governing  emissions  of  sulphur,  particulates and  air  toxics  that  are
expected to  be adopted under the  federal Clean Air Act  Amendments of 1990
and the Arizona Clean Air Act.

     Industry Risks;  Reserves.  The Company is  subject to the normal risks
encountered in the mining industry, such as unusual or unexpected geological
formations,  cave-ins,  flooding,  fires,  environmental  issues  and  water
issues.    The Company's  mineral reserves  may  not conform  to geological,
geomechanical, metallurgical or other expectations  with the result that the
volume and grade of reserves  recovered and rates of production may  be less
than  anticipated.  Further, market price fluctuations in copper, changes in
operating and capital costs and other factors may affect ore reserves.

     Development Projects.  The  existing open pit and underground  mines at
the Company's San  Manuel Division are scheduled to close  in 1994 and 1998,
respectively,  and its  open  pit  mine  at the  Pinto  Valley  Division  is
scheduled  to close in 1999.  The  Company is pursuing or evaluating several
development opportunities  in an  effort to enhance  its ore reserves.   The
Company is also in the  process of expanding and upgrading its  smelting and
refining  complex.   Development  of  these  projects will  require  several
hundred  million dollars in capital  investment.  To  the extent undertaken,
the Company intends to  finance its development projects with  internal cash
flow, cash  reserves and additional borrowings as necessary.  The success of
these projects is subject  to a number of factors, some of which are outside
of the Company's control.  The cost estimates for these projects are subject
to change.  If the Company is  unable to replace its reserves from the  mine
development  projects being  pursued or  evaluated, or  with other  reserves
identified or acquired in  the future, the Company's dependence  upon third-
party  sources to  supply copper  concentrate to  its smelting  and refining
operations would increase.

                           SELLING SECURITYHOLDERS

     The  following table provides  certain information with  respect to the
Common Stock owned by each Selling Securityholders as of March 25, 1994.


                                       Percentage                Percentage
                                        of Common                of Common
                                         Shares                    Shares
                                      Beneficially              Beneficially
                          Number of      Owned       Number of     Owned
                           Common       Prior to      Common       After
                           Shares       Offering      Shares      Offering
 Name                       Owned          (1)        Offered       (2)
 ----                    ----------   ------------  ----------   ----------
 DBL Liquidating Trust       86,022        *            86,022        0  %

 Morgenthaler Venture
   Partners II               76,319        *            21,505        *

 Warburg Pincus Capital
   Company, L.P.         19,220,216(3)     41.1%     3,213,073       34.2%

      TOTAL              19,382,557        41.5%     3,320,600       34.4%
                         ==========      ======     ==========     ======

_________________________

*    Represents less than 1% of the Company's outstanding Common Stock.

(1)  Includes  all shares of Common Stock  beneficially owned by the Selling
     Securityholder as  a percentage  of  the sum  of (i)  the Common  Stock
     outstanding  at  March  25,  1994,  and (ii)  the  1,000,000  shares of
     Common  Stock  reserved for  issuance in  connection  with the  Class B
     Warrants.

(2)  Assumes that the Selling  Securityholder disposes of all of  the shares
     of Common Stock  covered by this  Prospectus and  does not acquire  any
     additional shares of Common Stock.

(3)  Includes  892,473 shares  of Common  Stock underlying Class  B Warrants
     held by the Selling Securityholder and 2,320,600 shares of Common Stock
     previously acquired by the Selling Securityholder.

                            PLAN OF DISTRIBUTION

     This  prospectus  relates  to  shares of  Common  Stock  issuable  upon
exercise  of Class B Warrants.   Each Class B  Warrant is exercisable at any
time  prior to November 30, 1995  to purchase one share  of Common Stock for
$8.50  per share,  subject  to adjustments  in  certain  events.   Upon  the
exercise of a Class B Warrant, the Company will issue shares of Common Stock
directly to or for the order of the holder of the Class B Warrant.

     Additionally,  this prospectus  relates to  the  resale by  the Selling
Securityholders  of any  shares  of  Common  Stock  acquired  by  a  Selling
Securityholder upon the exercise  of a Class B Warrant and  to the resale by
Warburg,  Pincus  Capital  Company,  L.P. ("Warburg"),  one  of  the Selling
Securityholders, of 2,320,600 shares of Common Stock previously acquired  by
Warburg.   The Selling  Securityholders may  from time  to time  sell Common
Stock through underwriters, dealers or  agents, who may receive compensation
in the form of  underwriting discounts, concessions or commissions  from the
Selling Securityholders  and/or the purchasers  of the  securities for  whom
they may act as agent.  At the time a particular offering of Common Stock is
made,  to the extent required,  a Prospectus Supplement  will be distributed
with this  Prospectus which will  set forth  the aggregate number  of shares
being offered  and the terms  of the  offering, including the  names of  any
underwriters, dealers  or agents, any discount, commissions  and other items
constituting compensation from the Selling Securityholders and any discounts
or concessions allowed or reallowed or paid to dealers.

     Alternatively, the Selling Securityholders may from time to time effect
sales of Common Stock in one or more transactions pursuant to Rule 144 under
the  Securities  Act,  in  privately negotiated  transactions,  through  the
facilities  of the  NYSE, or otherwise,  at market prices  prevailing at the
time  of sale, at  prices relating to  such prevailing market  prices, or at
negotiated prices.  It is anticipated that any broker-dealers  participating
in  such sales of  securities will receive  the usual  and customary selling
commissions.

     The Company will  pay substantially all of the expenses incident to the
registration of  the Common  Stock offered hereby,  other than  underwriting
discounts, commissions  and selling  expenses with  respect to Common  Stock
being sold by the Selling Securityholders.

                               USE OF PROCEEDS

     The Company anticipates that the net  proceeds from the exercise of the
Class  B Warrants will be used for  general corporate purposes.  The Company
will not receive any proceeds  from the sale of Common Stock by  the Selling
Securityholders.


                          DESCRIPTION OF SECURITIES

Class B Warrants

     The Company issued  and sold 1,000,000 Class  B Warrants to Warburg  in
connection  with a  recapitalization of  the Company  on November  30, 1988.
Warburg  subsequently transferred  107,527 of  the Class  B Warrants  to two
other  institutional  investors  (collectively  with  Warburg,  the "Selling
Securityholders").

     Each Class  B  Warrant entitles  its holder  to purchase  one share  of
Common Stock at an exercise price of $8.50 per share, subject to adjustment,
at  any time prior to the Class  B Warrants' expiration date of November 30,
1995.  The Class B Warrants are not callable by the Company at any time.

     The Class B Warrants may be exercised by surrendering to the Company at
the principal  office of the  Warrant Agent a Warrant  certificate signed by
the   Warrantholder   or  his   duly   authorized   agent  indicating   such
Warrantholder's  election to  exercise  all  or a  portion  of the  Class  B
Warrants  evidenced  by  such  certificate.    Surrendered  Class B  Warrant
certificates  must be accompanied by payment of the aggregate exercise price
of the Class B Warrants to be exercised (the "Exercise Price").

     Upon  surrender of  the Class  B Warrants and  payment of  the Exercise
Price, the Company  shall deliver or cause  to be delivered, to or  upon the
written order of the exercising Warrantholder, certificates representing the
number  of shares of  Common Stock so purchased.   If fewer  than all of the
Class B Warrants evidenced by any Class B Warrant certificate are exercised,
the Warrant Agent shall deliver to the exercising Warrantholder a new  Class
B Warrant certificate representing the unexercised Class B Warrants.

     The number of shares purchasable upon  exercise of a Class B Warrant is
subject to adjustment pursuant to  anti-dilution provisions if, among  other
circumstances (i) the Company declares a dividend or makes a distribution on
outstanding shares  of Common  Stock in  shares  of Common  Stock, (ii)  the
Company subdivides,  combines or  reclassifies the  Common Stock,  (iii) the
Company issues Common Stock (or securities  convertible into, or exercisable
or exchangeable for,  Common Stock) for consideration  less than 95% of  the
most recent  closing price for  Common Stock,  (iv) the  Company declares  a
dividend or  other  distribution on  the  Common Stock,  except  for a  cash
dividend or  distribution which is in an amount  less than the excess of (x)
11% of  the average of  the daily  closing price  for Common  Stock for  the
trading  days  during  the  preceding  twelve  consecutive  calendar  months
multiplied  by the  weighted  average  number  of  shares  of  Common  Stock
outstanding during such twelve-month period (the "Annual Market Price") over
(y) the  fair market value  of the consideration  used to repurchase  Common
Stock during such twelve-month period, or (v) the Company repurchases Common
Stock for  consideration that,  when aggregated with  all other  repurchases
during the preceding twelve months, has a fair market value greater than the
excess of (x)  11% of the  Annual Market Price  over (y) the cash  dividends
paid on such twelve month period.

     Upon exercise of a Class B Warrant or Warrants, the Company will not be
required to issue fractional shares  and a holder of Class B  Warrants shall
receive the  number of whole  shares to  which the  Class B  Warrants to  be
exercised entitle  such holder.  In  determining the number of  shares to be
issued   upon  exercise,  a  holder  may  aggregate  all  fractional  shares
represented by  the Class B Warrants to be exercised  into whole shares.  If
after such aggregation any fractional share amount remains, the Company will
pay the holder an amount  in cash equal to  such fraction multiplied by  the
closing price of the Common Stock on the day of exercise.

     If the Company is unable for any reason to issue shares of Common Stock
upon  exercise of the Class  B Warrants, then  the Class B  Warrants will be
exercisable  for such number of shares of the Company's Series C Convertible
Preferred  Stock as equals  the number of  shares of  Common Stock otherwise
issuable  upon  the  exercise  of  the  Class  B  Warrants.    The Series  C
Convertible Preferred Stock has rights substantially identical to the rights
of  the Common  Stock, except  that such  preferred stock has  a liquidation
preference equal  to $.10 per share.  In the event that Series C Convertible
Preferred Stock becomes issuable upon exercise of  the Class B Warrants, the
Company will comply with any applicable registration  requirements under the
federal securities law, and will apply for the listing of such shares on the
principal  stock exchange or market system on which the Company's securities
are traded at the time.

Common Stock

     The following summary of terms of the Company's Common Stock  does  not
purport to be complete and is subject to, and qualified in its  entirety by,
the provisions of the Company's Certificate of Incorporation.

     The Company's  Certificate of Incorporation authorizes  the issuance of
100,000,000  shares  of Common  Stock.   As of  March  25, 1994,  there were
45,742,901  shares of  Common  Stock  outstanding  (excluding the  1,000,000
shares of Common Stock reserved for issuance in connection with the  Class B
Warrants).  The Common Stock is traded  on  the  NYSE.  On  March 25,  1994,
the closing sale price of the Common Stock, as  reported  on  the  NYSE  was
$15-7/8.

     All  outstanding shares  of Common  Stock are,  and the  shares offered
hereby, upon issuance, will be, fully paid and non-assessable.

     The holders of Common Stock are entitled to  receive dividends when and
as declared by  the Board of Directors  of the Company out  of funds legally
available  therefor, provided that if  any shares of  preferred stock are at
the  time outstanding,  the payment  of dividends  on Common Stock  or other
distributions  (including purchases of Common  Stock) may be  subject to the
declaration and payment  of full  cumulative dividends, and  the absence  of
arrearages in any mandatory sinking fund, on outstanding shares of preferred
stock.  As of the date hereof, the Company has two series of preferred stock
outstanding,  $100  million of  Series  D  Cumulative Convertible  Preferred
Stock,  which  carries a  5-5/8% cumulative  dividend,  and $100  million of
Series  E  Cumulative  Convertible  Preferred  Stock,  which  carries  a  6%
cumulative dividend.

     The  holders of Common Stock are entitled to one vote for each share on
all matters voted on by stockholders, including elections of directors.  The
holders of Common Stock do not have any conversion, redemption or preemptive
rights.  In the event of  the dissolution, liquidation or winding up of  the
Company, holders of Common Stock are entitled to share ratably in any assets
remaining after the  satisfaction in full of the  prior rights of creditors,
including  holders   of  the  Company's  indebtedness,   and  the  aggregate
liquidation preference of any preferred stock then outstanding.

     Certain provisions  of the  Company's Certificate of  Incorporation and
Bylaws may be considered as having an anti-takeover effect.  Such provisions
empower  the Board of Directors to fix  the rights and preferences of and to
issue  shares of preferred stock; limit  certain substantial stockholders of
the Company from  significantly increasing  their interest in  the stock  or
assets of the Company without the consent of the Board of Directors and/or a
supermajority of the  stockholders of the Company;  prohibit stockholders of
the  Company from  calling  a special  meeting;  place restrictions  on  the
ability  of stockholders to nominate  persons for the  position of director;
and require that  the Board of Directors be divided into  three classes.  In
addition, certain  provisions of law may  have the effect of  protecting the
Company against  undesired takeover attempts.   Specifically, under Delaware
law (and a similar provision of the Company's Certificate of Incorporation),
in  certain instances, significant  holders (as specified)  of the Company's
voting  stock may  not, without approval  of a  specified vote  of the other
stockholders,  or approval  of  the Company's  Board  of Directors  (or  the
independent members thereof) prior to becoming a significant holder, acquire
additional interests in the Company's assets or capital stock.

Transfer Agent

     The transfer agent for  the Common Stock is Mellon  Financial Services,
111 Founders Plaza, 11th Floor, East Hartford, Connecticut 06108.

                                   EXPERTS

     The consolidated balance sheets as of  December 31, 1993 and 1992,  and
the consolidated  statements of operations, changes  in stockholders' equity
and cash flows and the  related schedules for each of the three years in the
period  ended  December  31,  1993, incorporated  into  this  Prospectus and
elsewhere  in  the  Registration  Statement,  have  been  audited  by Arthur
Andersen  &  Co.,  independent public  accountants,  as  indicated  in their
reports with respect thereto,  and are incorporated herein in  reliance upon
the authority of said firm as experts in giving said reports.

                         VALIDITY OF THE SECURITIES

     The validity of the issuance of  the securities offered hereby will  be
passed upon  for the  Company by  Streich Lang,  P.A., 100  West Washington,
Suite 2100, Phoenix, Arizona 85003, counsel to the Company.


<PAGE>
                                   PART II

                   INFORMATION NOT REQUIRED IN PROSPECTUS


Item 14.  Other Expenses of Issuance and Distribution.

     The estimated expenses in connection with the issuance and distribution
of the securities being registered are as follows:

SEC registration fee  . . . . . . . . . . . . . . . . . . . . . .   $ 18,402
Legal fees and disbursements  . . . . . . . . . . . . . . . . . .   $ 15,000
Accounting fees and disbursements . . . . . . . . . . . . . . . .   $  5,000
Miscellaneous (including transfer agent and listing fees) . . . .   $  5,000


                                                                    $ 43,402

Item 15.  Indemnification of Directors and Officers.

     The Certificate  of Incorporation  provides that  the directors of  the
Company shall be under no liability  to the Company for monetary damages for
breach  of fiduciary  duty as  a director  of the  Company except  for those
specific breaches and  acts or omissions with respect to  which the Delaware
General  Corporation Law  (the  "Delaware Law")  expressly  provides that  a
corporation's certificate of incorporation shall not eliminate or limit such
personal  liability of  directors.   Section 102(b)(7)  of the  Delaware Law
provides that a corporation's certificate of incorporation may not limit the
liability of  directors for (i)  breaches of  their duty of  loyalty to  the
corporation and its stockholders,  (ii) acts or omissions not in  good faith
or which involve intentional misconduct or a knowing violation of law, (iii)
transactions  from which a  director derives  improper personal  benefit and
(iv) unlawful dividends or  unlawful stock repurchases under Section  174 of
the Delaware Law.

     Under  the  Delaware  Law, directors  and  officers  as  well as  other
employees and  individuals, may  be indemnified against  expenses (including
attorneys' fees),  judgments,  fines  and  amounts  paid  in  settlement  in
connection  with specified  actions,  suits or  proceedings, whether  civil,
criminal, administrative or investigative (other than an action by or in the
right of the  corporation, a  "derivative action"),  if they  acted in  good
faith  and in a manner  they reasonably believed to be  in or not opposed to
the best interest of the Company and, with respect to any criminal action or
proceeding, had no reasonable  cause to believe their conduct  was unlawful.
A similar standard of care is applicable in the case of a derivative action,
except that  indemnification only extends to  expenses (including attorneys'
fees)  incurred in connection  with defense or settlement  of such an action
and  the  Delaware Law  requires  court approval  before  there  can be  any
indemnification  where the  person  seeking indemnification  has been  found
liable to the Company.   The Company's By-laws provide that each  person who
was or is made a party to, or is involved in, any action, suit or proceeding
by reason of  fact that he or she is or  was a director, officer or employee
of the Company (or was serving at the request  of the Company as a director,
officer, employee or agent for another entity) will be indemnified and  held
harmless by the  Company to the full extent authorized  by the Delaware Law,
against  all   expense,  liability  or  loss   (including  attorneys'  fees,
judgments,  fines or  penalties  and  amounts  to  be  paid  in  settlement)
reasonably incurred by such  person in connection therewith.   The Company's
By-laws provide that rights  conferred thereby are contract rights  and will
include the right  to be paid  by the Company for  the expenses incurred  in
defending  the  proceedings  specified  above, in  advance  of  their  final
disposition, except that, if the Delaware Law so requires, such payment will
only be  made upon delivery  to the Company  by the indemnified party  of an
undertaking to repay all amounts so advanced if it  is ultimately determined
that the person receiving  such payments is  not entitled to be  indemnified
under  such  provision  or otherwise.  The  Company's  By-laws provide  that
persons indemnified thereunder may bring suit against the Company to recover
unpaid amounts claimed thereunder, and that  if such suit is successful, the
expense of bringing such a suit will be reimbursed by the Company.




Item 16.  Exhibits and Financial Statements.
 Exhibit                                                 Page or
  Number             Description                    Method of Filing

   4.1    Specimen certificate representing  Incorporated by reference to
          shares of the Common Stock         Exhibit 2 to the Registrant's
                                             Form 8-A dated October 30,
                                             1992
   5.1    Opinion of Streich Lang, P.A.              Filed Herewith

   24.1   Consent of Arthur Andersen & Co.           Filed Herewith

   24.2   Consent of Streich Lang, P.A.      Included in its opinion filed
                                             as Exhibit 5.1
   25.1   Powers of Attorney                   Included on Signature Page

_______________




Item 17.  Undertakings.

     The undersigned registrant hereby undertakes:

     (1)  To file,  during any  period in  which offers  or sales  are being
          made, a post-effective amendment to this registration statement:

          (i)    To include  any prospectus required by  Section 10(a)(3) of
                 the Securities Act of 1933;

          (ii)   To reflect  in the prospectus any  facts or  events arising
                 after the effective date of the registration statement  (or
                 the most  recent  post-effective amendment  thereof) which,
                 individually or in  the aggregate, represent a  fundamental
                 change in the  information  set forth in  the  registration
                 statement;

          (iii)  To include  any  material  information  with respect to the
                 plan  of  distribution  not  previously  disclosed  in  the
                 registration  statement  or any  material  change  to  such
                 information in the registration statement;

provided, however, that  paragraphs (1)(i) and (1)(ii)  do not apply if  the
registration  statement is  on  Form S-3  or Form  S-8, and  the information
required to be included in a post-effective amendment by those paragraphs is
contained in periodic reports filed by the registrant pursuant to Section 13
or  15(d) of the  Securities Exchange Act  of 1934 that  are incorporated by
reference in the registration statement.

     (2)  That, for  the  purpose of  determining  any liability  under  the
          Securities Act  of 1933, each such  post-effective amendment shall
          be  deemed  to be  a new  registration  statement relating  to the
          securities offered therein, and the offering of such securities at
          that time shall  be deemed to  be the  initial bona fide  offering
          thereof.

     (3)  To remove from registration by means of a post-effective amendment
          any  of the securities being registered which remain unsold at the
          termination of the offering.

     The undersigned registrant hereby undertakes:

     (1)  For purposes of determining any liability under the Securities Act
          of 1933, the information omitted from the form of prospectus filed
          as  part of this registration statement in reliance upon Rule 430A
          and  contained in  a form  of prospectus  filed by  the registrant
          pursuant to Rule 424(b)(1)  or (4) or 497(h) under  the Securities
          Act of  1933 shall  be  deemed to  be  part of  this  registration
          statement as of the time it was declared effective.

     (2)  For the purpose of determining any liability  under the Securities
          Act of 1933, each post-effective amendment that contains a form of
          prospectus shall  be deemed  to be  a  new registration  statement
          relating to  the securities offered  therein, and the  offering of
          such securities  at that time  shall be  deemed to be  the initial
          bona fide offering thereof.

     The  undersigned registrant  hereby  undertakes that,  for purposes  of
determining any liability under the  Securities Act of 1933, each  filing of
the registrant's annual report pursuant to section 13(a) or section 15(d) of
the Securities Exchange  Act of 1934 (and, where applicable,  each filing of
an  employee benefit plan's  annual report pursuant to  section 15(d) of the
Securities Exchange Act  of 1934) that  is incorporated by reference  in the
registration  statement shall be deemed  to be a  new registration statement
relating  to  the  securities offered  therein,  and  the  offering of  such
securities at that time shall be deemed to be the initial bona fide offering
thereof.

     Insofar as indemnification for liabilities arising under the Securities
Act of  1933 may be permitted to directors, officers and controlling persons
of  the registrant pursuant to  the foregoing provisions,  or otherwise, the
registrant  has been  advised  that in  the opinion  of  the Securities  and
Exchange  Commission  such  indemnification  is  against  public  policy  as
expressed  in the Securities Act  of 1933 and  is, therefore, unenforceable.
In  the  event that  a claim  for  indemnification against  such liabilities
(other than the payment by the registrant of expenses incurred or paid  by a
director,  officer or controlling person of the registrant in the successful
defense of any  action, suit or  proceeding) is  asserted by such  director,
officer  or controlling  person  in  connection  with the  securities  being
registered, the registrant will,  unless in the  opinion of its counsel  the
matter  has been  settled by  controlling precedent,  submit  to a  court of
appropriate jurisdiction the question whether such  indemnification by it is
against public policy as expressed in the Securities Act of 1933 and will be
governed by the final adjudication of such issue.

                                 SIGNATURES

     Pursuant  to  the requirements  of the  Securities  Act of  1933, Magma
Copper Company certifies  that it has reasonable grounds to  believe that it
meets all  of the requirements  for filing on Form  S-3 and has  duly caused
this Registration Statement  on Form S-3 to be  signed on its behalf  by the
undersigned, thereunto duly  authorized, in the City of  Tucson and State of
Arizona on March 28, 1994.

                                   MAGMA COPPER COMPANY,
                                   a Delaware corporation



                                   By /s/ J. Burgess Winter

                                     -----------------------------
                                          J. Burgess Winter
                                          President and
                                          Chief Executive Officer

     KNOW  ALL MEN  BY  THESE PRESENTS,  that  each person  whose  signature
appears below constitutes and appoints Donald J. Donahue, J. Burgess Winter,
Douglas J.  Purdom and  Andrew A. Brodkey,  and each of  them, his  true and
lawful  attorneys-in-fact and agents,  with full  power of  substitution and
resubstitution,  for him and in  his name, place  and stead, in  any and all
capacities, to  sign any and  all amendments  to this Form  S-3 Registration
Statement,  and  to file  the  same, with  all exhibits  thereto,  and other
documents  in   connection  therewith  with  the   Securities  and  Exchange
Commission, granting  unto said attorneys-in-fact  and agents,  and each  of
them, full  power and authority  to do  and perform each  and every  act and
thing requisite and necessary to be done in and about the premises, as fully
and to all  intents and purposes as  he might or  could do in person  hereby
ratifying  and confirming all that said attorneys-in-fact and agents, or his
substitute or substitutes,  may lawfully do  or cause to  be done by  virtue
hereof.

     Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Registration Statement has been signed below by the following persons in the
capacities and on the date indicated.


         Signature                     Title                    Date
         ---------                     -----                    ----

/s/  Donald J. Donahue       Chairman of the Board and      March 28, 1994
- --------------------------           Director
Donald J. Donahue

/s/ J. Burgess Winter       President, Chief Executive      March 28, 1994
- --------------------------       Officer, Director
J. Burgess Winter              (Principal Executive
                                     Officer)

/s/ Douglas J. Purdom        Vice President and Chief       March 28, 1994
- --------------------------       Financial Officer
Douglas J. Purdom            (Principal Financial and
                                Accounting Officer)

/s/ Christopher W. Brody             Director               March 28, 1994
- --------------------------

Christopher W. Brody

/s/ Judd R. Cool                     Director               March 28, 1994
- --------------------------
Judd R. Cool

/s/ John W. Goth                     Director               March 28, 1994
- --------------------------
John W. Goth

/s/ John R. Kennedy                  Director               March 28, 1994
- --------------------------
John R. Kennedy

/s/ Thomas W. Rollins                Director               March 28, 1994
- --------------------------
Thomas W. Rollins

/s/ Henry B. Sargent                 Director               March 28, 1994
- --------------------------
Henry B. Sargent

/s/ Simon D. Strauss                 Director               March 28, 2994
- --------------------------
Simon D. Strauss

/s/ H. Wilson Sundt                  Director               March 28, 1994
- --------------------------
H. Wilson Sundt

/s/ John L. Vogelstein               Director               March 28, 1994
- --------------------------
John L. Vogelstein




                                 EXHIBIT 5.1

                               March 28, 1994


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

     Re:       Magma Copper Company - Form S-3 Registration
               Statement

Ladies and Gentlemen:

     We  have  acted  as  counsel  to   Magma  Copper  Company,  a  Delaware
corporation  (the "Company"), in connection  with its Registration Statement
on Form S-3 (the "Registration Statement") filed under the Securities Act of
1933 relating to (i) the issuance of 1,000,000 shares of Common Stock, $0.01
par value per  share (the "Common Stock"),  issuable upon the exercise of an
equal  number  of Common Stock  Purchase Warrants  (the "Class B Warrants"),
(ii) the  resale by three  selling  securityholders of any  shares of Common
Stock  they may  acquire upon  exercise of the  Class B Warrants,  and (iii)
the resale  by one  selling securityholder of 2,320,600 additional shares of
Common Stock  previously acquired  by such selling  securityholder.  We have
also acted  as counsel  for the Company  with respect to  certain matters in
connection  with the  sale of  the Common  Stock and  in preparation  of the
required filings with the Securities and Exchange Commission and the various
state regulatory agencies involved.

     In that connection,  we have examined such documents, corporate records
and  other  instruments  as  we have  deemed  necessary  or  appropriate for
purposes  of this opinion, including the Amended and Restated Certificate of
Incorporation, as amended, and the Bylaws of the Company.

     Based upon the foregoing, we are of the opinion that:

     1.        The  Company  is  a  corporation  duly organized  and validly
existing under the laws of the State of Delaware.

     2.        The  Common Stock,  when  issued,  will be  duly and  validly
issued, fully paid and nonassessable.

     We acknowledge  that we are referred  to under the heading "Validity of
the  Securities" of  the  Prospectus  that  is  part  of   the  Registration
Statement,  and  we  hereby  consent  to  such  use  of  our  name  in  such
Registration  Statement  and  to  the  filing  of  this  opinion  with state
regulatory agencies in such states as may  require such filing in connection
with the registration of the Common Stock for offer and sale in such states.

                                Very truly yours,

                                /s/ Steven D. Pidgeon
                                ---------------------

                                Steven D. Pidgeon
                                For the Firm


                                EXHIBIT 24.1



                  CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



As independent public accountants, we hereby consent to the incorporation by
reference in this Form S-3 registration statement of our reports dated Janu-
ary 27, 1994 included in Magma Copper Company's Form 10-K for the year ended
December 31, 1993, and to all references to our Firm included in this regis-
tration statement.


/s/  Arthur Andersen & Co.
- --------------------------

Tucson, Arizona,
  March 25, 1994.



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