<PAGE>  1
                                                                    Exhibit 10


                          PURCHASE AND SALE AGREEMENT

      This   Purchase  and   Sale  Agreement   (hereinafter  referred   to  as
"Agreement")  is made  and effective  this 23rd  day of  August, 1995,  by and
between  Hecla Mining Company, a  Delaware corporation, whose  address is 6500
Mineral  Drive, Coeur d'Alene, Idaho   83814-8788 (hereinafter  referred to as
"Hecla"),  and Consolidated  Silver Corporation,  an Idaho  corporation, whose
address is 6500 Mineral  Drive, Coeur d'Alene, Idaho   83814-8788 (hereinafter
referred to as "Con Sil").

                           RECITALS AND DEFINITIONS

      WHEREAS, Hecla's wholly-owned Mexican  subsidiary, Minera Hecla, S.A. de
C.V.  (hereinafter referred to as  "Minera Hecla")(Minera Hecla  and Hecla are
sometimes collectively  referred to hereinafter as "Hecla") is a party to that
certain Contract dated April  27, 1995, with Minera Portree de Zacatecas, S.A.
de  C.V. (hereinafter referred  to as "Portree")  a copy of  which is attached
hereto as  Exhibit  A,  incorporated herein  by  this  reference  (hereinafter
referred to as the "Ojo Caliente Agreement");

      WHEREAS, Minera  Hecla holds certain rights and  obligations pursuant to
the Ojo Caliente Agreement, including, without limitation, the right to manage
the affairs of  and to acquire certain capital stock in  Minera El Morro, S.A.
de S.V.,  a Mexican corporate  entity (hereinafter referred  to as  "Minera El
Morro"),  formed pursuant  to the  Ojo  Caliente Agreement  to hold  title to,
explore  and develop the mineral  potential of certain  mining concessions and
other  rights and properties described therein (hereinafter referred to as the
"Property");

      WHEREAS, Hecla wishes to sell to Con Sil and  Con Sil wishes to purchase
from Hecla all  of Minera Hecla's rights, duties and  obligations, and any and
all stock held by Minera Hecla in Minera El Morro pursuant to the Ojo Caliente
Agreement, all on the terms and conditions specified in this Agreement;

      NOW,  THEREFORE, the parties, intending  to be legally  bound, do hereby
agree as follows:

                                   AGREEMENT

      1.  AGREEMENT OF PURCHASE AND SALE.  Hecla hereby agrees to cause Minera
Hecla  to  sell and  assign  to Con  Sil,  and Con  Sil  does hereby  agree to
purchase, or  cause a  wholly-owned subsidiary  of  Con Sil  to purchase,  and
assume from  Hecla, all on the  terms and conditions specified  herein, all of
Minera Hecla's rights,  duties and  obligations pursuant to  the Ojo  Caliente
Agreement, and any and




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all capital  stock  of Minera  El  Morro in  the possession  of  Hecla or  its
subsidiaries pursuant to the  Ojo Caliente Agreement upon the Closing  of this
Agreement.

      2.  CONSIDERATION.   Con Sil shall pay to  Hecla in cash at  Closing the
aggregate  amount of all of expenditures incurred  by Hecla or Minera Hecla in
(i) the  acquisition of the Ojo  Caliente Agreement, (ii) pursuant  to the Ojo
Caliente Agreement, and (iii) for  the benefit of Minera El Morro's  Property,


subject  to  Section  7(a)  of  this  Agreement  (the  "Purchase  Price"),  in
consideration  of Hecla's  grant of  its rights pursuant  to the  Ojo Caliente
Agreement.   Hecla's  expenditures through  the  dates indicated  therein  are
summarized  in  Exhibit B,  attached hereto  and  incorporated herein  by this
reference.

      3.   CLOSING.   The  closing  of the  transactions contemplated  by this
Agreement shall take  place within three (3) business days  after the later to
occur of:   (i)  Con Sil's  shareholder meeting and (ii) Con  Sil's closing of
the  Sunshine Agreement (as that  term in hereinafter  defined), in accordance
with  Section 8(b) of this Agreement, but in  any event no later than November
15, 1995,  at Hecla's Coeur  d'Alene, Idaho  offices, or such  other time  and
place as may be mutually agreed upon by Hecla  and Con Sil.  At Closing, Hecla
shall deliver to Con Sil (i)  a fully executed and acknowledged assignment and
assumption,  in a form  registrable by all  applicable governmental authority,
conveying Minera Hecla's  rights in the Ojo  Caliente Agreement; (ii) any  and
all stock  held by Minera  Hecla in Minera  El Morro to  Con Sil; and  (iii) a
summary  of  Hecla's  expenditures  to  the  date  of  Closing,  presented  in
substantially  the same  form  as  Exhibit  B.   All  taxes  assessed  on  the
transaction and all registration and recording fees shall be paid by Con Sil.

      4.   COOPERATION IN  STRUCTURING TRANSACTION.   Hecla and  Con Sil shall
cooperate  with  each other  in structuring  and  in closing  the transactions
contemplated herein  in a  manner which  will  minimize taxes  payable to  all
jurisdictions on the  transfers of Minera Hecla's  rights in the  Ojo Caliente
Agreement and shares of stock  from Minera Hecla to Con Sil, and Con Sil shall
have the right to form  such subsidiary companies as are necessary,  proper or
convenient to the completion of  such transfers, and each of Hecla and Con Sil
shall cause their respective subsidiary companies to take all such actions  as
are necessary, proper and convenient in completion thereof.

      5.    REPRESENTATIONS AND  WARRANTIES OF  HECLA.   Hecla  represents and
warrants to Con Sil:

            (a)  That it and its affiliates are corporations duly incorporated
      and  in good  standing in  their respective  states or  jurisdictions of
      their incorporation;




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            (b)   That it has the  capacity to enter into  this Agreement with
      respect to the  transactions contemplated herein and that  all corporate
      and other actions  required to authorize  it to  enter into and  perform
      this Agreement have been properly taken or shall be properly taken prior
      to Closing;

            (c)  That  entering into  and performing this  Agreement will  not
      breach any other agreement or arrangement to which it is a party;

            (d)  That this Agreement has been duly executed by  its authorized
      representatives, and is valid and binding upon it in accordance with its
      terms;

            (e)  That  the Ojo  Caliente Agreement  is valid  and binding,  no
      default exists  with respect to Hecla's performance  thereof, and Minera
      Hecla  may  assign its  interest therein  in  accordance with  the terms
      thereof.

      6.  REPRESENTATIONS  AND WARRANTIES OF CON SIL.   Con Sil represents and
warrants to Hecla:


            (a)    That it  is  a corporation  duly  incorporated and  in good
      standing in its state of incorporation;

            (b)   That it has the  capacity to enter into  this Agreement with
      respect to the  transactions contemplated herein and  that all corporate
      and other  actions required to  authorize it to  enter into  and perform
      this Agreement have been properly taken or shall be properly taken prior
      to Closing;

            (c)  That  entering into  and performing this  Agreement will  not
      breach any other agreement or arrangement to which it is a party;

            (d)   That this Agreement has been duly executed by its authorized
      representatives, and is valid and binding upon it in accordance with its
      terms.

      7.  HECLA'S COVENANTS.  Between the effective date of this Agreement and
the Closing:

            (a)  Hecla  shall expend no more than an  aggregate total of eight
      hundred thousand dollars ($800,000):  (i) in the acquisition of  the Ojo
      Caliente Agreement;  (ii) pursuant  to the  Ojo Caliente Agreement;  and
      (iii) for  the benefit of Minera El  Morro's Property.  Any expenditures
      by Hecla in excess of  the amount specified herein shall not  be payable
      pursuant to Section 2 of this Agreement.

            (b)  Hecla  shall permit Con Sil  and its representatives, at  Con
      Sil's sole risk and expense, to have full access to



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      Minera  El Morro's  Property  and  all  books  and  records  in  Hecla's
      possession pertaining thereto;

            (c)   Hecla  shall make  its personnel  and documents  related the
      transaction contemplated  hereby reasonably available  to Con Sil  as it
      may from time to time request;

            (d)  Hecla shall furnish such necessary information and reasonable
      assistance as may be necessary to complete the transactions contemplated
      herein;

            (e)   Hecla shall operate Minera El Morro's Properties and perform
      its  obligations under the Ojo Caliente Agreement in accordance with its
      terms, consistent  with past  management practices  and as  a reasonably
      prudent operator.

            (f)  Hecla  shall report  to Con Sil  all significant  activities,
      exploration  results and  such other  material developments  which occur
      with  respect  to the  Ojo Caliente  Agreement  or concerning  Minera El
      Morro's Property. 

            (g)  Hecla  shall not amend, or take  any steps to amend,  the Ojo
      Caliente Agreement, nor shall  Hecla grant any interest in  or otherwise
      encumber  the Ojo Caliente  Agreement, except  with the  express written
      consent of Con Sil, which consent shall not be unreasonably withheld.

            (h)   Hecla  shall perform and  complete prior to  the Closing all
      actions necessary to facilitate the assignment and assumption of the Ojo
      Caliente Agreement  and of  any and  all stock held  by Minera  Hecla in
      Minera El Morro pursuant to the terms of this Agreement.

            (i)    Hecla shall  not  issue any  press  release  or make  other
      publication of the terms  of this Agreement without giving  notice prior
      to such release or publication together with a draft thereof to Con Sil,
      and  obtaining the  written consent  of Con  Sil thereto,  which consent
      shall  not  be unreasonably  withheld. Con  Sil's  consent shall  not be
      required for such press releases and announcements as may be required by
      law or by any securities exchange on which Hecla's stock  is traded, and
      Con Sil shall nevertheless be provided with prior notice of such release
      or publication together with a draft of any such press release.

      8.  CON  SIL'S COVENANTS.  Between the effective  date of this Agreement
and the Closing:

            (a)    Con  Sil  shall  furnish  such  necessary  information  and
      reasonable assistance as may be  necessary to complete the  transactions
      contemplated herein;




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            (b)  Con Sil shall complete prior to  the Closing a meeting of its
      shareholders, and  at such meeting  its shareholders shall  consider for
      their  approval  the transaction  documented  by  that certain  Purchase
      Agreement among Con Sil  and Sunshine Precious Metals, Inc.,  dated July
      1, 1995 (herein referred to  as the "Sunshine Agreement"), and,  if such
      shareholder  approval is obtained, Con Sil shall complete the closing of
      the Sunshine Agreement;

            (c)  Con  Sil shall  report to Hecla  all significant  activities,
      results  and such  other  material developments  which  occur which  may
      effect Con Sil's obligations pursuant to this Agreement;

            (d)  Con  Sil shall perform and complete prior  to the Closing all
      actions necessary to facilitate the assignment and assumption of the Ojo
      Caliente  Agreement and  of any and  all stock  held by  Minera Hecla in
      Minera El Morro pursuant to the terms of this Agreement;

            (e)   Con  Sil shall  not issue  any press  release or  make other
      publication of the terms  of this Agreement without giving  notice prior
      to such  release or publication together with  a draft thereof to Hecla,
      and  obtaining the written consent of Hecla thereto, which consent shall
      not  be unreasonably withheld. Hecla's consent shall not be required for
      such press  releases and announcements as  may be required by  law or by
      any securities exchange  on which Con Sil's  stock is traded, and  Hecla
      shall  nevertheless be  provided with  prior notice  of such  release or
      publication together with a draft of any such press release.

      9.    HECLA'S  CONDITIONS PRECEDENT  TO  CLOSING.   Hecla  shall  not be
obligated  to close the transactions contemplated by this Agreement unless and
until all of the following conditions precedent are met at  or before the time
of Closing, unless waived in writing by Hecla:

            (a)    No  outstanding   material  liens,  encumbrances  or  other
      liabilities shall  exist against  Hecla's interest  in the  Ojo Caliente
      Agreement;

            (b)  Each of Con Sil's representations and warranties set forth in
      Section 6 of this Agreement shall be true and correct;

            (c)  Con  Sil shall have completed a meeting  of its shareholders,
      and  at such meeting its  shareholders shall have  approved the Sunshine
      Agreement;






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            (d)   Con  Sil shall  have completed the  closing of  the Sunshine
      Agreement in accordance with its terms and conditions.

      10.   CON SIL'S CONDITIONS PRECEDENT  TO CLOSING.  Con  Sil shall not be
obligated  to close the transactions contemplated by this Agreement unless and
until all of the following conditions precedent  are met at or before the time
of Closing, unless waived in writing by Con Sil:

            (a)    No  outstanding   material  liens,  encumbrances  or  other
      liabilities shall  exist against  Hecla's interest  in the Ojo  Caliente
      Agreement;

            (b)  Each of  Hecla's representations and warranties set  forth in
      Section 5 of this Agreement shall be true and correct;

            (c)   Hecla  shall have  received no  notice of  any breach  of or
      default in its performance of its obligations under any material term of
      the Ojo Caliente Agreement;

            (d)  Con  Sil shall have completed a meeting  of its shareholders,
      and at such meeting its shareholders shall have approved the transaction
      documented by that certain Purchase Agreement among Con Sil and Sunshine
      Precious Metals, Inc., dated July 1, 1995;

            (e)   Con Sil  shall have  completed the  closing of  the Sunshine
      Agreement in accordance with its terms and conditions.

      11.  HECLA'S RIGHT OF OFFER.  From and after Closing:

            (a)  If at any  time during the exploration or development  of the
      Property Con Sil or Minera  El Morro wish to sell, option, enter  into a
      farmout, lease, joint  venture, or  other agreement whereby  Con Sil  or
      Minera  El Morro would  transfer or grant  any portion of  or all of its
      rights in Minera El Morro or the Property to a  third party (hereinafter
      referred to as an  "Opportunity"), Con Sil shall provide  written notice
      to Hecla of  the Opportunity  containing a detailed  explanation of  the
      terms and conditions  thereof.  Hecla shall  have sixty (60) days  after
      its receipt  of such notice in which  to provide Con Sil  with a written
      notice of its  exercise of its right to enter into an agreement with Con
      Sil or Minera  El Morro on  the terms contained in  Con Sil's notice  of
      Opportunity to  Hecla.  In the  event that Hecla elects  to exercise its
      right to  acquire the Opportunity  pursuant to  this Section 11  of this
      Agreement, Hecla and Con Sil shall promptly and in good faith proceed to
      finalize and execute a written agreement setting forth the terms thereof
      within thirty (30) days of Hecla's



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      notice.   In  the event  Hecla does  not exercise  its right  under this
      Section  11 of this Agreement within said  sixty (60) day period Con Sil
      or Minera El  Morro may for a  period of one  hundred eighty (180)  days
      thereafter negotiate and enter into an agreement with any third party on
      terms  no more  favorable to such  third party  as those  offered to and
      refused by Hecla.   In  the event Con  Sil or Minera  El Morro does  not
      enter into  an agreement with  a third  party on such  terms within  one
      hundred eighty (180) days of Hecla's refusal, Hecla's rights pursuant to
      this  Section 11 of this  Agreement shall be  automatically revived, and
      Con Sil shall again be obligated to provide notice to Hecla of its or of
      Minera  El Morro's  intention  to enter  into  an agreement  with  third
      parties as provided for herein.

            (b)   In  the event  that Con  Sil or Minera  El Morro  cancels or
      terminates, or receives notice  of any cancellation or termination  of a
      sale, option, farmout, lease, joint venture, or  other agreement whereby
      a third  party obtained or  would obtain  any portion of  or all of  Con
      Sil's rights  in Minera  El Morro  or its Property,  Con Sil  shall give
      written notice  of such cancellation  or termination to  Hecla, together
      with a summary and  copies of supporting documentation of  all additions
      to mineral  reserves located on  the Properties and  feasibility studies
      prepared with respect to the Properties  as a whole.  In the  event that
      Con  Sil or Minera  El Morro  thereafter seek  participation of  a third
      party in the  manner described in  Section 11(a) of this  Agreement, Con
      Sil or Minera El Morro  shall first provide Hecla with the  notices, and
      Hecla may exercise the rights specified, therein.

            (c)   In the event  that Con  Sil or  Minera El  Morro intends  to
      abandon or otherwise surrender its interest in Minera El Morro or any of
      its  Property, without  receiving  any consideration  therefor, Con  Sil
      shall first give written notice of its intention to Hecla prior to March
      1 of  the year  in which Con  Sil intends to  abandon or  surrender such
      Property or interest,  and offer to transfer or assign  such Property or
      interest  to  Hecla  at  no  cost  to  Hecla  other  than  as  specified
      hereinbelow, and Hecla shall have fifteen (15) business days to elect to
      accept Con Sil's or Minera El Morro's transfer or assignment and pay the
      cost of conveyancing and recording.   Con Sil and Minera El  Morro shall
      provide any records in its possession as requested by Hecla that relates
      to any Property or  interest being abandoned by Con Sil  and transferred
      to Hecla.  In the event Con Sil does not advise Hecla by March 1 of such
      year of its intentions to abandon or surrender any of  Minera El Morro's
      Property or  part(s) thereof, and in the absence of written consent from
      Hecla  thereto, Con  Sil shall  maintain and  cause Minera  El  Morro to
      maintain all its  properties in good standing, make all  filings and pay
      all taxes, assessment, rental, advance royalty or other fees



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      associated  therewith necessary  or  convenient to  keep  all Minera  El
      Morro's Property in good standing until  March 31 of the following year.
      Furthermore, Con Sil shall  perform or ensure the performance  by Minera
      El  Morro of  all reclamation work  required by  agreement or  by local,
      state  or  federal  law, regulations  or  permits  with  respect to  the
      abandoned property transferred to  Hecla pursuant to this Section  11 of
      this Agreement.

      12.  SURVIVAL.  The provisions of Section  11 of this Agreement shall be
deemed to survive the Closing of the transactions contemplated herein, and are
expressly agreed by the parties not to be merged into any closing document.

      13.   GENERAL.
      
            (a)    ENTIRE  AGREEMENT.    This Agreement  contains  the  entire
      agreement between the parties hereto and supersedes and replaces any and
      all other agreements.

            (b)   NOTICES.  All notices  and other communications  ("Notices")
      to  a  party  hereto  shall  be  in  writing  and   shall  be  addressed
      respectively as follows:

      If to Hecla:      Hecla Mining Company
                        6500 Mineral Drive
                        Coeur d'Alene, Idaho  83814-8788
                        ATTN:  Vice President - Metal Mining

      If to Con Sil:    Consolidated Silver Corporation
                        6500 Mineral Drive
                        Coeur d'Alene, Idaho  83814-8788
                        ATTN:  President

            All  Notices shall  be given  either by  personal delivery  to the
      party,  or  by  electronic  communication,  with  an  original copy  and
      confirmation sent  by registered  mail return receipt  requested, or  by
      registered  mail  return  receipt  requested.    All  Notices  shall  be
      effective and shall be deemed delivered:  (i) If by personal delivery on
      the  date of delivery during normal business hours, and if not delivered
      during  normal  business  hours,  on  the  next  business  day following
      delivery, and (ii) if  by electronic communication on the  next business
      day  following receipt  of the  electronic communication,  and (iii)  if
      solely by  mail on the next business day  after actual receipt.  A party
      may change its address by Notice to the other parties hereto.

            (c)   TRANSFER.  Subject to  Section 11 hereof, Con  Sil shall not
      transfer or assign,  and shall not allow Minera El  Morro to transfer or
      assign, any portion or all the Property in respect of which there exists
      an obligation to Hecla



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<PAGE>  9

      hereunder unless the transferee  or assignee first agrees in  writing to
      accept the obligations of Con Sil to Hecla under the terms of Section 11
      of this Agreement.

            (d)   CONTINUING COOPERATION.   Each  of the parties  hereto, upon
      the  request  of the  other party,  shall  do, execute,  acknowledge and
      deliver,  or cause to be  done, executed, acknowledged  or delivered all
      such further  acts, documents, assignments,  transfers, conveyances, and
      assurances,  both  before  and  after  Closing,  as  may  be  reasonably
      necessary  or   desirable  to   effect  complete  consummation   of  the
      transactions contemplated by this Agreement.

            (e)    CONTROLLING LAW;  ATTORNEY FEES.  The  terms and conditions
      of this Agreement  shall be interpreted  in accordance with the  laws of
      the State of Idaho, United States of America, and any dispute of fact or
      law  arising  as  a result  of  the  transactions  contemplated by  this
      Agreement shall be  resolved by the appropriate Idaho state  court or in
      the United States  District Court  for the  District of  Idaho, and  the
      parties  hereto  do   hereby  submit  and   consent  to  the   exclusive
      jurisdiction of the above-mentioned courts for purposes of resolving any
      dispute  arising  under this  Agreement.   The  prevailing party  in any
      dispute arising in connection  with this agreement shall be  entitled to
      an award of its reasonable attorneys' fees, expenses and costs.
      
            (f)   NO  STRICT   CONSTRUCTION.    This   Agreement  and  wording
      contained herein have been  arrived at by the mutual  negotiation of the
      parties.  Accordingly, no provision of this Agreement shall be construed
      against  one party  or in  favor of  another party  merely by  reason of
      draftsmanship.

            (g)   EXECUTION IN  COUNTERPARTS.  This Agreement  may be executed
      in  two or more  counterparts, each  of which shall  be deemed to  be an
      original,  but which together shall be deemed  to constitute one and the
      same instrument.

            (h)   SEVERABILITY.   Each  provision of  this Agreement  shall be
      interpreted in such manner as to be effective and valid under applicable
      law, but if any provision of this Agreement is held to be prohibited  by
      or  invalid under applicable  law, such  provision shall  be ineffective
      only  to   the  extent  of  such  prohibition   or  invalidity,  without
      invalidating the  remainder of such provision or the remaining provision
      of this Agreement.

            (i)   CAPTIONS.   The  captions  used in  this  Agreement are  for
      convenience  of reference  only and  do not  constitute a  part of  this
      Agreement,  and  the   captions  shall  not   be  construed  to   limit,
      characterize, or in any way affect any provision of this Agreement.



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            (j)   CURRENCY.   All references  to money  in this  Agreement are
      references  to  the lawful  currency of  the  United States  of America,
      unless expressly stated otherwise herein.

      IN WITNESS WHEREOF the parties have executed this Agreement effective as
of the day and year first above written.

HECLA MINING COMPANY                CONSOLIDATED SILVER CORPORATION



By: /s/ J. T. Heatherly             By: /s/ Gerald G. Carlson      
   -----------------------------      ----------------------------
Name:       J. T. Heatherly         Name:       Gerald G. Carlson
Title:      Vice President          Title:      Vice President

ATTEST:                                   ATTEST:



By: /s/ Michael B. White            By: /s/ Nathaniel K. Adams     
   -----------------------------      ----------------------------
Name:       Michael B. White        Name:       Nathaniel K. Adams
Title:      Secretary               Title:      Assistant Secretary





















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