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AMENDING AGREEMENT

This Agreement dated May 19, 2005 is made

Between

LUMINA COPPER CORP., a company
incorporated under the laws of the Province of British Columbia, and having a
head office at 1550  625 Howe Street, Vancouver,. British Columbia

(Lumina)

And

DAVID STRANGof 3269
143rd Street, Surrey, BC V4P 3M2

(the Executive)

RECITALS

|A. | The parties entered into an Executive Bonus/Retention
      Agreement (the Bonus Agreement) dated June 21, 2004 wherein Lumina
      agreed to provide additional incentive to the Executives compensation
      arrangements under the Executives employment agreement with
  Lumina.
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|   |                                                                                                                                                                                                                                                                                           
|B. | All the parties to the Bonus Agreement desire to amend
      the above mentioned Bonus Agreement.                                                                                                                                                                                         

NOW THEREFORE in consideration of mutual covenants and
agreements hereinafter set forth (the receipt and sufficiency of which is hereby
acknowledged and agreed) the parties hereto have agreed to amend the Agreement
and now covenant and agree as follows:

***1.***    
***Definitions***In this agreement all words and phrases
in initial capitals (unless otherwise defined or the context requires otherwise)
shall have the same meanings ascribed to them in the Agreement.

***2.***    
***Governing Law***This Agreement will be governed by
and construed in accordance with the laws of the British Columbia and the laws
of Canada applicable therein.

***3.***    
***Severability***If an arbitrator, court of other
tribunal of competent jurisdiction determines that any one or more of the
provisions contained in this Agreement is invalid, illegal or unenforceable in
any jurisdiction, the validity, legality and enforceability of such provision or
provisions shall not in any way be affected or impaired thereby in any other
jurisdiction and the validity, legality and

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enforceability of the remaining provisions contained herein
shall not in any way be affected or impaired thereby, unless in either case as a
result of such determination this Agreement would fail in its essential
purpose.

***4.***    
***Executive Bonus/Retention Agreement to Remain in
Force***Except as amended hereby, the Bonus Agreement shall
remain in force enforceable against the Parties thereto and shall henceforth on
execution be read together with the amendment herein contemplated.

***5.***    
***Waiver***If any party breaches any provision of this
Agreement, the failure of any other party to require strict performance will not
constitute a waiver of such breach or otherwise prejudice the other party from
subsequently enforcing the provisions hereof as they relate to the breach in
question or any similar or other breach. No waiver of any of the provisions of
this Agreement will be deemed to constitute a waiver of any other provision
(whether or not similar) of this Agreement, nor will such waiver constitute a
continuing waiver unless otherwise expressly provided in writing duly executed
by the party to be bound thereby.

***6.***    
***Amendment to Executive Bonus/Retention
Agreement***Paragraphs 1,2,3,5, and 8 of the Bonus Agreement to
be deleted and replaced with the following:

1.      RETENTION BONUS

If the Executive remains in the employ of any one or more of
Regalito Copper Corp, Northern Peru Copper Corp, Global Copper Corp and(or)
Lumina Resources Corp. throughout the period commencing on the date hereof and
ending on the earlier of a Change of Control or in the event Regalito undertakes
in a transaction or a series of transactions a sale of assets pursuant to which
all or substantially all of the then current business of Regalito is transferred
to an arms-length third party, or December 31, 2008 Lumina shall award from its
Share Bonus Plan, 10 days thereafter, 34,000 common shares of Lumina as a fully
earned bonus. Subject to section 6 hereof, should the Executive leave Lumina, be
terminated with or without just cause or become Totally Disabled prior to
earning any bonus hereunder, this provision shall be null and void and the
Executive shall not be entitled to any bonus shares or any part of any such
bonus or any other compensation in connection herewith and the Executive hereby
releases Lumina with respect hereto.

2.      SHARE APPRECIATION BONUS

|(a) | Provided the Executive is in the employ of Regalito
      Copper Corp. at such time as the share price of Regalito reaches CDN$8.00
      and trades at or above CDN$8.00 for a period of five consecutive trading
      days on such Canadian Stock Exchange as Regalito may trade (or if Regalito
      is no longer trading on a Canadian Stock Exchange then such determination
      shall be made after conversion from lawful currency of the United States
      of America), Lumina shall award from its Share Bonus Plan, 10 days
      thereafter, 10,000 common shares of Lumina as a fully earned bonus.
      Subject to section 6 hereof, should the Executive leave Regalito, be
      terminated with or without just cause or become Totally Disabled prior to
      earning any bonus hereunder this provision shall be null and void
    and
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|    | the Executive shall not be entitled to any bonus shares
      or any part of any such bonus or any other compensation in connection
      herewith and the Executive hereby releases Lumina with respect
    hereto.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
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|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|(b) | Provided the Executive is in the employ of Northern Peru
      Copper Corp. at such time as the share price of Northern Peru Copper Corp.
      reaches CDN$3.00 and trades at or above CDN$3.00 for a period of five
      consecutive trading days on such Canadian Stock Exchange as Lumina may
      trade (or if Northern Peru Copper Corp. is no longer trading on a Canadian
      Stock Exchange then such determination shall be made after conversion from
      lawful currency of the United States of America), Lumina shall award from
      its Share Bonus Plan, 10 days thereafter, 10,000 common shares of Northern
      Peru Copper Corp. as a fully earned bonus. Subject to section 6 hereof,
      should the Executive leave Northern Peru Copper Corp., be terminated with
      or without just cause or become Totally Disabled prior to earning any
      bonus hereunder this provision shall be null and void and the Executive
      shall not be entitled to any bonus shares or any part of any such bonus or
      any other compensation in connection herewith and the Executive hereby
      releases Lumina with respect hereto.
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3.      TRANSACTION BONUS

Provided the Executive is in the employ of Lumina on May 9,
2005, 15,000 common shares of Lumina as a fully earned bonus.

5.      MAJOR TRANSACTION BONUS

Provided the Executive is in the employ of Regalito at such
time as Regalito shall undertake a sale of any one or more of its resource
properties in a single transaction having a transaction value equal to or
greater than US$100,000,000, Lumina shall award from its Share Bonus Plan, 10
days thereafter, 25,000 common shares of Regalito as a fully earned bonus.
Should the Executive leave Regalito, be terminated with or without just cause or
become Totally Disabled prior to earning any bonus hereunder this provision
shall be null and void and the Executive shall not be entitled to any bonus
shares or any part of any such bonus or any other compensation in connection
herewith and the Executive hereby releases Lumina with respect hereto.

8.      CHANGE OF CONTROL

(a)
In the event of a Change of Control or in the event Regalito undertakes in a
transaction or a series of transactions a sale of assets pursuant to which all
or substantially all of the then current business of Regalito is transferred to
an arms-length third party, and provided the Employee shall continue to provide
his services until the completion of such Change of Control, all bonus shares
issuable under Sections 1, 2(a), 3 and 4 hereof notwithstanding they made not
have been earned as contemplated herein shall be payable to the Executive 10
days after the Change of Control or earlier if required, on such date as may be
required, such that such shares may be tendered into the event that lead to the
Change of Control in exchange for the consideration being paid in respect of
such Change of Control.

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(b)     
In the event of a Change of Control or in the event Northern Peru Copper Corp.
undertakes in a transaction or a series of transactions a sale of assets
pursuant to which all or substantially all of the then current business of
Northern Peru Copper Corp. is transferred to an arms-length third party, and
provided the Employee shall continue to provide his services until the
completion of such Change of Control, all bonus shares issuable under Sections
1, 2(b), 3 and 4 hereof notwithstanding they made not have been earned as
contemplated herein shall be payable to the Executive 10 days after the Change
of Control or earlier if required, on such date as may be required, such that
such shares may be tendered into the event that lead to the Change of Control in
exchange for the consideration being paid in respect of such Change of
Control.

***7.***    
***Arbitration***

Any dispute arising under this Agreement will be determined by
a single arbitrator to be appointed by the parties as follows:

| | (a) | either party may refer any such matter to arbitration by
      written notice to the other and, within 14 calendar days after receipt of
      such notice, the parties will agree on the appointment of an
      arbitrator;                                                                                                                   
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| |     |                                                                                                                                                                                                                                                                                                                                                 
| | (b) | the language of the arbitration will be English, except
      to the extent that expert evidence is required in Spanish, in which case a
      certified translator will be made available if requested by any of the
      parties;                                                                                                            
| |     |                                                                                                                                                                                                                                                                                                                                                 
| | (c) | no person will be appointed as an arbitrator hereunder
      unless such person agrees in writing to act;                                                                                                                                                                                                                                       
| |     |                                                                                                                                                                                                                                                                                                                                                 
| | (d) | upon appointment in accordance with section (a), the
      arbitrator will immediately proceed to hear and determine the matter in
      question and unless otherwise agreed, such hearing shall take place in
      Vancouver, British Columbia;                                                                                              
| |     |                                                                                                                                                                                                                                                                                                                                                 
| | (e) | the arbitration proceedings shall be carried out in
      accordance with the Rules of the International Chamber of Commerce in
      force on the date of this Agreement, save as said Rules shall conflict
      with the provisions of this section, in which case this section shall
      prevail;                                         
| |     |                                                                                                                                                                                                                                                                                                                                                 
| | (f) | the determination by the arbitrator will be made within
      45 days after his appointment subject to any reasonable delay due to
      unforeseen circumstances and the decision of the arbitrator will be in
      writing and signed by the arbitrator and will be final and binding upon
      the parties who will abide by such decision;
| |     |                                                                                                                                                                                                                                                                                                                                                 
| | (g) | if the parties cannot agree on a single arbitrator as
      provided in section (b), or if the person appointed is unwilling or unable
      to act, either party will have the right to request the Supreme Court of
      British Columbia to mediate in the appointment of a mutually acceptable
      arbitrator;                           
| |     |                                                                                                                                                                                                                                                                                                                                                 
| | (h) | in the absence of agreement, the Court shall appoint an
      arbitrator; and                                                                                                                                                                                                                                                                   
| |     |                                                                                                                                                                                                                                                                                                                                                 
| | (i) | the arbitrators fees shall be paid by both parties
        in equal parts during the course of the arbitration but upon final decision
        of the dispute, the defeated party shall pay all costs and reimburse all
        arbitration costs, including the amounts paid by the prevailing party.                                         

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***8.***    
***Time***

Time shall be of the essence hereof.

***9.***    
***Notices***

Any notice or other writing required or permitted to be given
hereunder or for the purposes hereof shall be sufficiently given if delivered by
courier or facsimile transmission to the party to whom it is given addressed to
such party at:

| | (a) | if to Lumina Copper Corp. at:                                   
| | --- | ----------------------------------------------------------------
| |     |                                                                 
| |     | 1550  625 Howe Street Vancouver, British Columbia
      V6C 2T6
| |     |                                                                 
| |     | Attention: Robert Pirooz Facsimile No.:
      604.687.7041      
| |     |                                                                 
| | (b) | if to David Strang at:                                          
| |     |                                                                 
| |     | 5373 Canvasback Road Blaine,
  Washington                       

or at such other address as the party to whom such writing is
to be given shall have last notified to the party giving the same in the manner
provided in this clause. Any notice delivered by courier or facsimile to the
party to whom it is addressed shall be deemed to have been given and received on
the Business Day next following the day it was delivered or telecopied.

***10.***    
***Enurement***

This Agreement shall enure to the benefit of and be binding
upon the parties hereto and their respective successors and permitted
assigns.

***11.***    
***Assignment***

This agreement may only be assigned together with the Bonus
Agreement and then only as contemplated therein.

***12.***    ***Counterparts***

This Agreement may be executed in as many counterparts as may
be necessary and each such counterpart agreement so executed shall be deemed to
be an original and such counterparts together shall constitute one and the same
instrument. This Agreement and any counterpart thereof may be delivered by
facsimile and when so delivered shall be deemed to be an original.

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***13.***    
***Further Assurances***

The parties will execute such further and other documents and
do such further and other things as may be necessary or convenient to carry out
and give effect to the intent of this Agreement. Either party may record this
Agreement or a short form document or documents evidencing this Agreement in the
appropriate public records in Chile and each party will execute and deliver all
such further documents and instruments and will do such things, as are
reasonably required to facilitate such registration.

***14.***    
***Headings***

The headings of the sections of this Agreement are for
convenience only and do not form a part of this Agreement nor are they intended
to affect the construction or meaning of anything herein contained or govern the
rights and liabilities of the parties.

IN
WITNESS WHEREOF the parties hereto have executed these presents as of the day
and year first above written.

| |     | LUMINA COPPER CORP. 
| | --- | --------------------
| | By: |                     
| |     | Authorized Signature
| |     |                     
| |     |                     
| |     | **DAVID STRANG**    
| |     |                     

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