Document:

Bridgeport Ventures Inc.: Exhibit 4.20 - filed by newsfilecorp.com

Exhibit 4.20

FIRST MODIFICATION
LETTER OF INTENT – OPTION
AGREEMENT

In Copiapó, on August 27, 2010, there appear Nelson Onofre
Roa Barahona, National identification card No. 7.501.315 -9, Mr. Eric
Leopoldo Roa Barahona, national identification card No. 9.592.648 -7, Mr.
Gabriel Emilio Roa Barahona, national identification card No. 7.150.733
-5, and Mrs. Rosa del Carmen Roa Barahona, national identification card
No. 9.367.996 -2, who appear individually and on behalf of the legal mining
company that may be formed with respect to the mining property referred to
herein, all domiciled in Parcela 7, Nantoco, municipality of Tierra Amarilla
(hereinafter all of them together Resources S.A., represented by Francisco
Schubert Seiffert, national identification card No. 6.095824 -6, and by Mr.
Marcelo Antonino Olivares Cabrera, national identification card No. 10 703
661-K, all domiciled in the city of Santiago at No. 3,895-7 Camino del Sol,
municipality of Lo Barnechea (hereinafter indistinctly the “Buyer”), have
convened in the following modification of the Letter of Intent signed between
the parties in private instrument dated June 23 of this year, authorized by the
Notary Publico of the city of Copiapó, Mr. Hernán Cañas Valdés on the 29th of
the same month indicated, hereinafter the “LI”, in the terms that are detailed
below: 

	1. 	In accordance with the LI, once the LI was signed, that is, on June
      29, 2009, the Buyer had 30 business days to study the titles and
      preference with third parties, which once completed, if in agreement with
      its conclusions, the Buyer promised to sign the final Option
      Agreement at the latest seven days after the termination of the revision
      indicated. 
	 	 
	2. 	The parties hereby modify and substitute the above agreement, in the
      sense that Buyer will have an additional period of 120 business
      days, counted from this date, that is, until January 8, 2011 including
      this alter date, to continue with the study of the titles of the property
      and preference of third parties, including, especially the authorization
      to freely enter the mining claim subject of the LI, “Trillador 1 al 14”
      (the “Property”) for the purpose of developing all reconnaissance and
      exploration work of the Property including the execution of a geophysical
      survey (GS) and all the supplementary and accessory Works to such
      exploration work for its full and total conclusion, according to the
      convenience of the Buyer, in the terms that are indicated in number
      6 following (the "Revision on site”). The parties expressly establish that
      the Revision on Site that by virtue of this act the Seller permits
      the Buyer to carry out in the Property, does not authorize the
      latter to perform drilling work, which can only be effected once the
      respective final Option agreement has been signed. 

 

Upon expiration of the above period, if the Buyer agrees
with its conclusions, it promises to sign the final Option Agreement at the
latest seven business days after the termination of the revision indicated that
is, at the latest on Monday January 17, 2011, or before if the Seller is
notified in writing . After this last period has expired, it will be
understood that the Buyer has no interest in persevering in the execution
of the final Option agreement, when numeral 4 following becomes applicable, and
it being understood that the LI has terminated ipso facto and without any effect
after which the Buyer must abandon the Property. 

1

With regard to the purchase price agreed for the Option
Agreement and its first installment, that is to say US$ 50,000 (fifty thousand
dollars of the United States of America) to be paid when the Option agreement
was signed, considering the extension of the period convened in number 2 above,
the Buyer hereby gives an advance imputable to such first installment, of
US$ 25,000 (twenty five thousand dollars of the United States of America)
equivalent in national currency to $ 12,831,750 (twelve million eight hundred
and thirty one thousand seven hundred and fifty), in accordance with the value
of the observed dollar published by the Central Bank of Chile of $ 513.27 per
US$1 that the parties expressly agree to apply. In this act, each one of the
persons of the Seller declare that they receive such payment to their
entire satisfaction through check of Banco Security No. 4672703 of the current
account owned by the Buyer, drawn in the name of Mr. Eric Roa Barahona,
authorizing its deduction from the payment of the first installment of the
Option Agreement, if this is definitively executed. In the event that the
referred to check is protested due to lack of funds or any other reason the LI
shall be understood terminated ipso facto and without any effect, and the
Buyer must abandon the Property

	3. 	The Buyer has the facultative and unilateral right not to
      persevere in the execution of the final Option agreement at any time,
      having in such case no future obligation of any type with the
      Seller, and the payment that it makes in this act will remain in
      the hands of the Seller, without the obligation to return it, in
      the capacity of only and total indemnification for the damages that, being
      linked to the LI may have caused, including this modification. 
	 	 
	4. 	In case of advanced termination of the LI and if the Buyer does
      not persevere in the execution of the final Option Agreement, it will
      deliver to the Seller all the documents and antecedents of any
      study it may have made from the Works of Revision on Site that by virtue
      of this instrument it is expressly authorized to carry out 
	 	 
	5. 	For the purpose of free access of Río Condor Resources S.A., each one
      of the persons that corresponds to the Seller party hereby grants
      special permit of access to the Property, being able to enter with the
      personnel and machinery that it may decide for the purpose of helping the
      Buyer to decide in the best way possible the Revision on Site
      during the effectiveness of the LI, in the terms of No. 1 above. Likewise,
      it especially authorizes the Buyer to exhibit the present access
      permit before any administrative or judicial authority including for
      example the Ordinary courts of Justice, Public Ministry, Chilean Police, Investigators
      Police and any other administrative or juridical organ that may be
      required in order to materialize this special access permit. 

2

		The opposition, directly or by any intermediary, of any individual who
    is part of the Seller, will be understood as a serious violation of
    this permit authorizing the Buyer to demand any legal indemnification
    for the damages approved by the Buyer. 
	 	 
	6. 	It is agreed to increase the authorization of exploitation of the
      Seller of 2,000 to 3,000 tons per month, in the terms agreed in the
      LI. 
	 	 
	7. 	In everything that is not expressly modified in this instrument, the
      LI will continue to be fully in effect and binding for both parties, this
      instrument being understood as an integral part of it for all legal and
      contractual purposes. . 

This modification of the LI is signed and authorized in two
counterparts of the same text, each party keeping one. 

	Nelson Onofre Roa Barahona 	/s/ Nelson Onofre Roa Barahona
    
	ICI. 7.501.315-9 	   
	Seller 	   
	  	   
	Eric Leopoldo Roa Barahona 	/s/ Eric Leopoldo Roa Barahona
    
	IC 9.592.648-7 	   
	Seller 	   
	  	   
	Gabriel Emilio Roa Barahona 	/s/ Gabriel Emilio Roa Barahona
    
	IC 7.150.733-5 	   
	Seller 	   
	  	   
	Rosa del Carmen Roa Barahona 	/s/ Rosa del Carmen Roa Barahona
    
	IC 9.367.996-2 	   
	Seller 	   
	  	   
	Francisco Schubert Seiffert 	/s/ Francisco Schubert Seiffert
    
	IC 6.095.824 – 6 	   
	by Río Condor Resources S.A. 	   
	Buyer 	   
	  	   
	Marcelo Antonino Olivares Cabrera 	/s/ Marcelo Antonino Olivares Cabrera
    
	IC 10.703.661-K 	   
	by Río Condor Resources S.A. 	   
	Buyer 	   

Copiapó August 27, 2010

3Bridgeport Ventures Inc.: Exhibit 4.22 - Filed by newsfilecorp.com

Exhibit 4.22

AMENDMENT OF OPTION AGREEMENT FOR PURCHASE OF 
MINING
CONCESSIONS, EXERCISE OF OPTION AND PURCHASE

RIO CÓNDOR RESOURCES S.A. 

AND 

CONTRERAS VILLAR, MARIO LEONCIO AN OTHERS

In Copiapó, on September 15, 2010, before me [NOTARY MENTIONS],
there appear: (a) RIO CÓNDOR RESOURCES S.A., closely held stock
corporation engaged in mining, taxpayer number 76,072,443-2 properly
represented, as will be evidenced by Mr. FRANCISCO SCHUBERT SEIFFERT,
Chilean, divorced, mechanical engineer, national identification card number
6,095,824-6 and Mr. MARCELO ANTONINO OLIVARES CABRERA, Chilean,
unmarried, lawyer, national identification card No. 10,703,661-K, all domiciled
in the city of Santiago and in transit in this city, at Camino del Sol number
3895-7 Borough of Lo Barnechea, hereinafter indistinctly “RCR” or the
“Beneficiary”; (b) Mr. MARIO LEONCIO CONTRERAS VILLAR, Chilean,
pensioned, married and with full separation of property, national identification
card number 2.800.468 -0, domiciled in this city at No. 177 Vicuña St., Borough
of Copiapó hereinafter indistinctly and as may be pertinent the “Offeror”, the
“Seller” or the “Mortgagor” and (c) Mr. LUIS JUAN DEPETRIS DEFLORIAN,
Chilean, married, and with full separation of property, entrepreneur, national
identification card number 6.462,196 -3, pro se and on behalf, as will be
evidenced Asesorías e Inversiones Invermondo Limitada, limited liability
company engaged in the business of its denomination, TPN 77.931.440 -1,
both domiciled in the city of Santiago, and in transit through this city, at
Avenida Eduardo Frei Montalva number 9870, Borough of Quilicura, hereinafter
indistinctly and jointly the “Mortgagee”, the appearing parties of legal age who
evidenced their identity with the aforementioned cards and state:

1

FIRST. BACKGROUND 

1.1. By public deed dated 23 January 2010, issued by the
Notary of Copiapó Mr. Luis Alberto Contreras Fuentes, amended by public deed
dated March 16th, 2010, issued by the Notary of Santiago Mrs. Antonieta Mendoza
Escalas (the “Option Deed”), MARIO LEONCIO CONTRERAS VILLAR, as the
Offeror, granted in favor of RIO CÓNDOR RESOURCES S.A. the option to buy,
by irrevocably offering to sell, assign and transfer, in the terms outlined in
article 179, final paragraph of the Mining Code, the mining tenements named
“SIMONETTA UNA AL VEINTE” (the “Property”), whose incorporation deed and
measurement certificate are registered on page 747, backside, number 182 of the 2000 Ownership Registry
of the Mines Keeper of Copiapó accounting for the ownership deed to the name of
the Offeror, hereinafter indistinctly referred to the “Option”. The Option
terms, conditions and wording are expressed in the clauses contained in the
Option Deed detailed in this Section.

2

1.2. The period during which the Option Beneficiary or
its assigns or successors may freely accept or deny the Property purchase offer
expires at midnight of the last day of the forty-eight month period as from the
date of the Option Deed, that is, no later than the twenty-third day of January,
2014. Likewise, it was agreed that the offered sales price is the amount of one
million US Dollars, payable in the terms indicated in clause number six of the
Option Deed, and the amount of thirty thousand US Dollars has been paid in
advance to the date of the execution of the Option Deed. The Offeror has
acknowledged receipt of that amount at full satisfaction which receipt is
ratified hereon.

1.3. The Option in favor of RCR was registrated on page
thirty-two, number 15 of the 2010 Registry of Mortgages and Liens Registry, of
the Mines Keeper of Copiapó. Likewise a pledge and disposal prohibition granted
by the Offeror in favor of RCR, is registered on page Ten, backside, number
eight of the 2010 Prohibitions and Interdictions Registry, of the above
captioned keeper. 

3

1.4. Mr. LUIS JUAN DEPETRIS DEFLORIAN &
ASESORIAS E INVERSIONES INVERMONDO LIMITADA, have also appeared to the
Option Deed execution, considering that they and the Offeror have undersigned
the instrument named “Mining Tenements Sales Cancellation, Settlement and
Transaction”, hereinafter referred to the “Transaction”, by virtue of which, the
parties cancel the sales of the tenements “SIMONETTA 1 AL 20” (subject
matter of this Option) of Mr. MARIO LEONCIO CONTRERAS VILLAR to
ASESORIAS E INVERSIONES INVERMONDO LIMITADA, keeping the former the
ownership of the tenements “SIMONETTA 1 AL 20”, admitting a total debt of
four thousand two hundred Unidades de Fomento in favor of LUIS JUAN DEPETRIS
DEFLORIAN and ASESORIAS E INVERSIONES INVERMONDO LIMITADA, which can
be called upon if the Beneficiary exercises the Option. The Mortgagor and the
Mortgagee have also agreed in the Option Contract to exchange the balance due
equaling four thousand and two hundred Unidades de Fomento to the total amount
of one hundred and seventy-six thousand US American Dollars (the “Debt”) which
debt is to paid in two installments: The first payments shall be made for the
amount of fifty thousand US Dollars and the second payment shall be made for one
hundred and twenty-six thousand US Dollars, after twelve and twenty-four months,
respectively, as from January 23, 2010. Such payment shall be made by RCR against the amount owned to the
Beneficiary. of the Option Deed.  

4

1.5. In order to secure the payment of the debt
mentioned in the preceding section, the following encumbrances and prohibitions
over the tenements “SIMONETTA 1 AL 20” are maintained in favor of Mr. LUIS JUAN
DEPETRIS DEFLORIAN and ASESOR¥AS E INVERSIONES LIMITADA. To wit: (i) Mortgage
registered on page 129, number 51, of the 2008 Mortgage and Encumbraces Registry
of the Mines Keeper of Copiapó; and (ii) Prohibition to place encumbrances or
dispose or execute any acts or contracts registered on page fifty-seven, number
thirty-three of the 2008 Prohibitions and Interdictions Registry of the same
Mines Keeper.

1.6. Additionally, on the Option Deed, the Mortgagee to
the sole effects of the execution of the Option, canceled the mortgage and the
prohibition outlined in section one.four above, being the mortgage incorporated
in favor of RCR as a first degree mortgage, and the mortgage incorporated in
favor of the Mortgagee as a second grade Mortgage. One.seven. Through
letter dated fourteenth of July, 2010, RCR notified the Offeror and the
Mortgagee of a major force event, for on July 7, 2010, RCR made a site visit to
the land occupied by the Property, in order to conduct prospecting activities as
expressly authorized under Clause number four of the Option Deed, but RCR was not allowed to enter the Property by a
third party and such situation has not changed to date. As a consequence of such
situation, since that date RCR has faced and continues to face a major force
event in terms of the clause number twelve of the Option Deed, notifying the
Offeror by means of the above mentioned Notification that the Option application
is understood as suspended from that date to the expiration of the major force
event, after such circumstance is communicated in writing by the Offeror to RCR
and the Offeror and the Mortagee acknowledge receipt of such notification and
understand the scope thereof.

5

TWO: Amendment to the Mining Concessions
Purchase Option Contract The Offeror and the Beneficiary, with the
Mortgagee’s express consent, hereby agree to amend the Option in the terms
outlined below. Such amendment shall be valid on this date.

2.1. Clause number six of the Option Deed shall be
amended and replaced with the text outlined below:

“SIX: PRICE OF THE OFFERED SALES 

6

6.1. The offered sales price shall be
composed of a fixed part (the “Fixed Part”) and an overprice subject to the
fulfillment of the condition (the “Overprice”): (a) Fixed Price.- RCR
shall pay if the Option being the subject matter of the Option Deed is
exercised, as a sales fixed price the total amount of one hundred and
five US Dollars. From that amount, the Offeror has received at its full
satisfaction thirty thousand US Dollars and the Offeror acknowleges receipt
thereof, the balance of seventy five thousand US Dollars being payable in the
following terms and conditions: (i) ten thousand US Dollars when the Option is
exercised; and (ii) seventy-five thousand US Dollars no later than January 23,
2011. The payment of the balance of the sales price outlined in number (ii)
above shall be made in the terms specified in section Six.Three below. In case
of non payment, the terms outlined in Section Six.Four and
Six.Five shall apply; and (b) Overprice:- Total amount
eight hundred and ninety-five thousand US Dollars payable by RCR to the
Offeror on the condition that in the period expiring on April 15, 2014, an
Expert in Mining Resources and Reserves, as mentioned in Law number twenty
thousand two hundred and thirty-five of 31 December, 2007, shall issue a
technical report according to the provisions contained in Article eighteen of
such Law, determining that on the tenements “SIMONETTA 1 AL 20” there are
mining resources for a minimum quantity of five million tons (the “Condition”).
Should those resources be determined as non existing on the Expert’s technical
report, then the overprice shall be not be applicable, notwithstanding the
payments made by RCR against such Overprice as agreed on section 6.1 below and
they shall be considered to the benefit of the Seller as only and compensating indemnity for any damage that
the Overprice non-payment may have caused or will eventually cause.

7

6.2. Against the overprice, that is the lump sum of
895.0000 US Dollars, RCR shall pay to the Offeror the amounts specified in the
terms outlined below: (a) 150,000 US Dollars, no later than April 15,
2012; (b) 245,000 US Dollars no later than April 15, 2013; and (c)
500,000 US Dollars no later than April 15, 2014. Should RCR consider the
condition as met prior to the date stated in letter (c) above, or should RCR
waive to that condition and decide to pay the total amount of the overprice
prior to that date, after the Option has been executed, RCR shall pay in cash
any amount considered to be outstanding to the date of the fulfilment or express
waiver to that condition until such overprice is entirely paid. 

6.3. The payment of the sales price balance indicated in
number (ii) of letter (a) of section 6.1 above, and the payment of each of the
installments of the overprice outlined in letters (a) to (c) of Section 6.2
above, shall be made at the office of the Notary who authorizes this Deed, his
successor or replacement, against the Offeror’s signature of the relevant
certificate of receipt or the signature of the Mortagee, as applicable. The
liability of RCR to the Offeror regarding the payment of each of the above cited
installments of the overprice, shall be considered as entirely met with the
delivery of a sight draft issued to the name of the Offeror or the Mortgagee,
as applicable, for the corresponding amount. Each sight draft shall be delivered
by the dates stipulated on paragraph (ii) of letter (a) of section 6.1 above,
and paragraphs (a) to (c) of section 6.2 above. The mentioned sight drafts shall
be issued for the amount corresponding to the relevant installment according to
the exchange rate valid to the payment date on its equivalent in Chilean pesos.
The Notary shall not deliver to the Offeror and/or the Mortgagee, where
applicable, or to anybody representing their rights, the corresponding sight
draft, but against the signature of the relevant receipt certificate (with
express waiver to any resolution action for the price balance or instalment of
the regarding overprice, and express issuing of release and cancel from the
Mortgagee in terms of section 5.1 of clause fifth hereinafter). The public deed
draft of receipt shall be given by RCR to the Notary in charge. The Notary fees
because of these operations shall be paid by RCR.

8

6.4. Should RCR for any reason or motive be late in the
payment of the sales price balance indicated in letter (ii) of letter (a) of
number 6.1 above, the payment of the Overprice (once the condition is met) or
should RCR be late in the payment of any of the installments outlined in letters
(a) to (c) of number 6.2 above, RCR shall have an extension period of fifteen
days as from the date when the condition is considered to be met Should RCR fail
to make any payment when due, it shall be understood that it has no intention to pay the
Fixed Price balance or the Overprice, or any balance due. In that case and not
needing any judicial or arbitral ruling, the following terms will be applied, as
needed. (i) Should RCR fail to execute the Option, then this Option Deed shall
be terminated immediately, not needing any judicial or arbitral ruling; or (ii)
Should RCR exercise the option RCR shall transfer to the Offeror and then the
Seller the Property at the total lump sum of one US Dollar which amount shall be
deemed as paid-up at the time when the transfer contract is delivered, in
accordance with the following terms:  

9

6.4.1 The parties shall sign the respective document
that puts the Property transfer on record, in accordance with any of the above
mentioned cases, in a period of thirty (30) calendar days as from the deadline
granted to RCR for the fulfillment of the respective duty, with the Seller’s
express statement to waive to any cancellation action and the collection of the
balance of the sales fixed price or the Overprice balance, as applicable.

6.4.2. Upon the expiration of the above mentioned
period, and if the transfer deed has not been undersigned yet, the party that is
willing to meet such duty may engage the services of the attorneys-at-law
Patricio Pinto Castro and Marcelo Olivares Cabrera, for them to jointly sign and
deliver – after accrediting the circumstances detailed in number 6.4 hereof- on
behalf of the breaching party, all documents that may be necessary for the materialization of the
mentioned transfer. The expiration of the period that RCR has to make the
payments against the balance of the sales price or the overprice, as applicable,
shall be certified by the Notary authorizing this instrument, his successor or
replacement, for him to certify the respective period plus the extension period
of fifteen (15) calendar days during which RCR ex officio has failed to leave
the sight draft and relevant public deed in custody and with instructions in the
terms outlined in section 6.3 above. Upon the expiration of the above mentioned
period, and if the transfer deed has not been signed yet, the party that is
willing to meet such duty may request the services of the arbiter nominated in
clause thirteen hereof for him to sign and deliver – after accrediting the
circumstances detailed in number 6.4 hereof- on behalf of the breaching party,
all documents that may be necessary for the materialization of the mentioned
transfer. The expiration of the period for RCR to make the payments against the
Overprice shall be certified by the Notary authorizing this instrument, his
successor or replacement, who shall certify the expiration of the respective
period plus the mentioned fifteen calendar days of extension.  

10

6.4.3. To the effects hereof, Mr. MARIO LEONCIO
CONTRERAS VILLAR and RIO CÓNDOR RESOURCES S.A. specially empower the
attorneys-at-law PATRICIO PINTO CASTRO y MARCELO OLIVARES CABRERA, for them to act jointly and grant and
sign all documents that may be necessary for the materialization of the final
transfer. The proxy outlined hereon is of free nature and the attorney is
released from the duty to report his/her actions. 

11

6.5. If RCR fails to pay the balance of the sales fixed
price indicated in letter (ii) of letter (a) of number 6.1 above, or any of the
installments of the Overprice outlined in letters (a) to (c) of number 6.2
above, and the deadlines to pay or complete the payment of such concepts are
expired, or if RCR expresses at any time its will of not to materialize the
offered sales, not to pay the balance of the sales fixed price, or not to pay
any of the Overprice installments, such circumstances will not ensue any
liability to RCR, except for the fulfilment of the provisions contained in
number 6.4 above, and no damage of whatsoever nature will be caused to Mr.
MARIO LEONCIO CONTRERAS VILLAR, Without detriment to the fact that he
will keep the amounts paid by RCR on account of installments of the fixed price
or Overprice or patents, which will be anyhow be understood as single and total
compensation for consequential damages, loss of profits or effective or
potential damages that may have occurred now or in the future to the Offeror by
reason of this Contract, the execution or termination of this Contract or for
any other reason in relation hereto, not there being any duty for extraordinary payments and all actions or rights are now waived
in connection with this contract.”  

12

2.2. Having the Mortgagee agreed upon the Sales Price
amendment and the schedule of the payments indicated in section two.one
above, he expressly agrees that the payment of the Mortgagor’s debt
installments, as detailed in letter (ii) of number 7.3 of Clause Seven of the
Option Deed will be paid with a portion of the payments to be made by RCR to the
Mortgagor against the balance of the sales fixed price, on the date indicated in
letter (ii) of (a) of number 6.1 above, and the first installment of the above
mentioned Overprice, as outlined in letter a) of number 6.2, of number 2.1
above.

2.3. The Option Deed continues to be in force in all
respects not expressly amended herein.

THREE: Option Exercise and Sales 

3.1. By virtue of the new Clause Six of the Option Deed
(outlined in number 2.1 of clause Two above), RIO CONDOR RESOURCES S.A.
duly represented by FRANCISCO SCHUBERT SEIFERT and MARCELO OLIVARES
CABRERA, hereby express its acceptance of the sales offer of the tenements
“SIMONETTA 1 AL ” in the terms agreed upon on the Option

13

3.2. As a consequence of the acceptance of the Option
and by virtue of the provisions contained in Article 169 of the Mining Code,
RIO CONDOR RESOURCES S.A. has formalized the sales of the following
mining tenements called “SIMONETTA UNA AL VEINTE”, specified in Section
1.1 of Clause one above.

3.3. Mr. MARIO LEONCIO CONTRERAS VILLAR, hereby
declares to have received at his full satisfaction the amount of ten thousand
(USD10,000) American Dollars, equaling in domestic currency to the amount of
four million nine hundred forty eight thousand three hundred (CLP 4,948,300), at
the exchange rate published by the Central Bank on September 14, 2010, of 494.83
per American Dollar. The Offeror hereby expresses his full satisfaction to this
regard. Hence and in the light of the amount paid to this date of thirty
thousand (USD30,000) American Dollars, according to the provisions contained in
section 1.2 above, the Offeror considers to have received the full payment of
the Sales Fixed Price of the Option for the lump sump of forty thousand American
Dollars and the only amount due is the balance of the sales fixed price,
detailed in letter (ii) of letter (a) of number 6.1 above, without prejudice to
the outstanding balance of the Overprice agreed upon in letter b) of Section 6.1
of the new Clause Six of the Option Deed.

3.4. The Property is sold “as it is”, with all its
customs and practices, duly registered rights and easements, and the Seller is
liable for any legal disencumbrance.

14

FOURTH. OVERPRICE 

4.1. RIO CONDOR RESOURCES SA is required to meet for Mr.
LEONCIO CONTRERAS MARIO VILLAR the overprice equivalent to US$895,000 under the
condition and the terms agreed by the parties in letter b) Section 2.1 of the
new clause Sixth of the Option deed, which is detailed in paragraph 2.1 of the
second clause of this instrument. 

4.2. The Seller, Mr. LEONCIO CONTRERAS MARIO VILLAR,
states accept that the obligation of paying the overprice is conditional subject
to the condition established in the clause set out in paragraph 4.1 above,
condition which has a modal nature because it is subject both to certain events
or conditions and / or terms which depend on one party as well as random
circumstances from exploration or mining operations. Therefore, and moreover,
the Seller declares his express consent to RCR - taking account of their
technical and professional experience - will decide at its sole discretion
whether or not it meets the condition based on the technical report from a
Competent Person Resources and Mineral Reserves of the Republic of Chile which
to be issued later than April 15, 2014, resigning from now to any action or
claim based on RCR’s decision. 

15

FIFTH. MORTGAGE DEBT. PAYMENT AND PARCIAL RELEASE OF
ENCUMBRANCES 

5.1. By this act, moreover and because the exercise of
the Option by RCR, the Mortgagor, Mr LEONCIO CONTRERAS MARIO VILLAR, recognized
that is obligated to pay the Debt to the Mortgagee, that is, jointly Mr. JUAN
LUIS DEPETRIS DEFLORIAN and INVERMONDO AND INVESTMENT CONSULTING LIMITED, as
follows, as already agreed in the Deed of Option: (i) the Mortgagor
agrees to pay to Mortgagee the amount referred in two installments, the first of
US$50,000 and the second US$126,000, payable from the payments RCR must fulfill
upon the balance of the purchase price stated in subparagraph (ii) of
subparagraph (a) of section 6.1, as well as the payment of the first Overprice
installment detailed on letter a) of paragraph 6.2, both of the new clause Sixth
of the Option Deed, detailed in section 2.1 of the clause second of this
instrument. (ii) For purposes of realizing these two payments, the
Mortgagor ratifies and gives special and irrevocable power of attorney to RCR,
in case the obligation to pay the Overprice previously mentioned keeps in force,
pay directly to Mortgagee the amounts detailed in the preceding paragraph
deducting such amounts from the amount of the Overprice installments that
Mortgagor perceives as a beneficiary of the Overprice. Furthermore, the
Mortgagor agrees and accepts that, if applicable the respective payment, he will
receive directly from: 1) the balance of Fixed Price sale referred to in subparagraph (ii) of
subparagraph (a) of section 6.1 of new Sixth clause of the Deed Option, the
amount of US$15,000, corresponding to the remaining US$50,000 to the payment of
the Debt, in terms of herein; and 2) the amount mentioned in point (b) Section
6.2 of the clause Sixth, the amount of US$24,000, corresponding to the remaining
126,000 to the payment of the Debt, also in terms of herein. It is expressly
stated that the power of attorney hereby conferred by the Mortgagor to RCR is of
a gratuitous nature and that the attorney in fact is exempted from the
obligation to render account of its fulfillment. (iii) With respect to
the payments that RCR must make to the Mortgagee by virtue if this section 5.1,
they will be made in a sight draft taken to the order of Mr. Luis Juan
Depetris Deflorian, for which the Mortgagee confers to him a special and
irrevocable mandate in order that he may receive such payments, give receipts,
cancellations and releases, and subscribe the rest of the acts or contracts, by
public or private instrument, that may be pertinent, even being able to transact
wherein necessary. (iv) Once both installments of the debt are paid and
cancelled, the Mortgagor may request the Mortgagee for a public deed of release
of the transaction.

16

5.2. Mr. Luis Juan Depetris Deflorian, pro se and
on behalf of Asesorías e Inversiones Invermondo Limitada hereby releases
for the sole effect of the execution of this Amendment of Option Contract, Exercise of Option and Purchase the constitution of the
mortgage and prohibition identified in section 1.5 of clause first above. This
mortgage and prohibition will be cancelled and released definitively against the
payment of the second installment of the Overprice established in section 6.2 of
the new clause sixth of the Deed Option. For these purposes, the Mortgagee binds
itself to grant such declaration of cancellation and release of the mortgage and
prohibition in the deed of receipt for payment of the Debt. 

17

5.3. In the event that for any cause or reason RCR not
meet the balance of the purchase price stated in subparagraph (ii) of
subparagraph (a) of section 6.1 and / or the payment of the first installment of
Overprice pointed out in letter a) of section 6.2, both of the new clause Sixth
of the Deed Option, then RCR has a waiting period of 15 days from the date of
expiry of the respective installment term to make up the payments. If as a
result of failure to pay the balance of the Fixed Price and / or the Overprice
then the Mortgagee does not receive payment for one or both installment of
section 5.1 above, means that the Debt remains unpaid, totally of for remaining
balance. Once RCR has been paid to the Mortgagor the first installment (pointed
out in letter (a) of Section 6.2 of new clause Sixth of Deed Option), in case of
noncompliance full and timely the payment to the Mortgagee of his part on that
first installment, the Debt become due in full, resulting in the acceleration of
it. 

18

5.4. Furthermore, the Mortgagor and the Mortgagee
expressly declare that RCR has no obligation of any kind for the Mortgagee with
respect to the debt or any other type of obligation relative to the Transaction,
RCR acting only and exclusively by instruction and mandate of the Mortgagor, in
the terms indicated in this fifth clause. Likewise, the Mortgagee recognizes
expressly that any notice and other acts that RCR promises to carry out in its
favor in this contract constitute acts of mere liberality that do not constitute
contractual obligations for RCR or that give rise to claims o an action on the
part of the Mortgagee against RCR in case of omission, delay or imperfection in
its fulfillment except those that may result from failure to comply the mandate
that the Mortgagor has granted in this act to RCR, in favor of Mortgagee, that
to materialize, integrated and timely, the payment of the Debt that is
guaranteed with the mortgages and prohibition mentioned in this deed, once RCR
pays the respective installment to the Mortgagor. The parties expressly declare
tha Mr. JUAN LUIS DEPETRIS DEFLORIAN acting by himself or through its agents or
attorneys or through INVERSIONES INVERMONDO LIMITADA partners, have not had any
involvement in the negotiations which have taken place between Mr. MARIOLEONCIO
CONTRERAS DEL VILLAR y RCR, so declares completely ignores the reasons, causes,
circumstances and purposes that led to RCR and Offeror to modify the option agreement mentioned in clause first herein, in terms
detail in this instrument.  

19

SIXTH. CESSION OF RIGHTS 

It is hereby convened that RCR will be authorized to assign
either fully or partially the rights and obligations that arise for it from this
Contract, the assignee becoming responsible for the same obligations that RCR
contracts in this instrument and about which express record must be left in the
assignment contract, for which it will suffice to send to the Offeror written
notice about such assignment, to which a true copy of the assignment contract
will be attached. The Offeror cannot assign any of its rights and obligations
without the prior written consent of RCR. 

SEVENTH. FORCE MAJEURE 

It is hereby convened that the obligations assumed by RCR by
virtue of this Contract in favor of the Offeror, specifically those relative to
the payment of the price of purchase sale detailed in the sixth clause above,
will be suspended in cases when events constitutive of Force Majeure occur
according to the definition of such concept by Article 45 of the Civil Code,
including events such as, but although this is not limitative, expropriation or
confiscation of the facilities, fulfillment of orders or requirements of any governmental authority,
opposition of the owners of superficial lands comprised by the Properties, acts
of war, rebellion, sabotage and damages that result from them, fire, floods,
earthquakes, explosions or accidents, popular riots, illegal strikes or other
similar cause, whether of the same kind or nature or that have not been under
the control of RCR, and that even exercising reasonable care could not have been
prevented. This does not release RCR from its obligation of maintenance of the
Properties, including the payment of the claim fees. RCR must give notice in
writing to the Offeror and if pertinent, to the Mortgagee, of any event of Force
Majeure within the period of ten calendar days, counted from the date on which
such event occurred. Once the event has terminated RCR must also communicate it
in writing, and the fulfillment of the obligations will be resumed immediately.
In case of disagreement in the qualification of the eventual force Majeure, the
Offeror may resort to the arbitrator appointed in this instrument, requesting
what is considered convenient for its rights.

20

EIGHTH. OBLIGATIONS OF RCR UPON TERMNATION OF THE CONTRACT.

If for whatever reason the purchase sale offered is not
implemented, RCR must deliver free to the Offeror the information obtained as a
result or on occasion of the exploration made in accordance with this Contract both geological, of drillings, samplings, geophysics,
analyses, core drills, grades, etc., the list given being merely exemplary.
Likewise, RCR must clear the Properties to which this Contract refers and that
will be the object of exploration completely from staff, constructions,
installations, equipment, provisions and machinery. RCR must comply with these
obligations within the maximum term of sixty days, counted as may be pertinent
from the date on which it gives notice by certified letter of its decision of
not persevering in the purchase sale contract offered or else when the period of
effectiveness of the option expires.

21

NINETH. EXCHANGE RATE. 

The quantities of currency expressed in dollars in this deed
will be liquidated in pesos, national currency, at the Exchange rate of the
observed dollar of the United States of America published in the Official
Gazette on the day of the respective calculation, in accordance with what is
provided in No. 6 of chapter I of the Compendium of International Exchange
Rules. In the absence of such rate of exchange, the rate of Exchange to which
reference is made in article 20 first paragraph of Law 18,010 will be
applied.

22

TENTH. COMMUNICATIONS AND NOTICES. 

Any notice or communication that one of the parties must send
to the other as stipulated herein, and provided it does not contemplate a
special form of notice, must be sent in writing, in Spanish, to the Offeror, and
to the Mortgagee if pertinent and it will be considered delivered if the party
notified receives it in its domicile indicated at the beginning of this
Contract, or, if it is sent by certified mail, the remittance is made by a
Notary Public with the rights prepaid and the letter is addressed to such party
in its aforementioned domicile. In the notices by certified letter the party to
whom it is addressed will be understood notified on the fifth business day after
it is sent. Either of the parties can, through notice sent to the other party in
the way foreseen in this Clause, change its domicile for the reception of such
notices. The notices can also be sent by fax or electronic mail, but the
original must be sent by Mail or by hand within the following twenty four
hours.

ELEVENTH. MORTGAGE AND PROHIBITION.

In order to guarantee the proper fulfillment of this contract,
RCR constitutes in favor of the Seller, for whom its representative accepts,
second degree mortgage with respect to the Properties and prohibition to
encumber, alienate o4r dispose in any way of the Properties, or enter into acts
or contracts that limit or affect the tenancy, possession or4 ownership of the
Properties without the prior and written consent of the Seller, including among the
Properties the exploration concessions or mining claims that succeed or
substitute such Properties, for which RCR must concur at the simple requirement
of the Seller to the execution of the deeds that may be necessary to materialize
such mortgages and prohibitions. Once the payment of the overprice is done or
the Properties has been transferred to the Seller in accordance to sections 4.3
of clause forth hereinafter, the mortgage and prohibition will have no value or
effect and the Registrar of Mines of Copiapó may be requested to release them.
It is placed on record that upon release of the mortgage and prohibition
constituted in favor of Luis Juan Depetris Deflorian and Inversiones Invermondo
Limitada, as stipulated in sections 1.5 of clause first herein, this in
accordance with the conditions indicated previously, the mortgage that through
this clause is constituted will, only for that fact, become first degree
mortgage, without the need of any declaration, which will be placed on record by
the respective Registrar of Mines upon exhibition of this instrument.

23

TWELFTH. EXPENSES

The dues charged by the Notary and the Registrar of Mines and
Real Estate shall be for account of RCR.

24

THIRTEENTH . ARBITRATION.

Should there arise any discrepancy, difficulty, difference of
opinion or controversy between the parties in relation with the effectiveness of
this Contract, the validity, interpretation, breach, partial fulfillment,
execution or partial lack of execution or resolution thereof or any other cause
in relation with this agreement, will be resolved by arbitration, hereby
appointing for such purpose and in the order indicated Mr RAFAEL VERGARA
GUTIERREZ, if he should be unable, Mr. JUAN LUIS OSSA BULNES and in
defect of the latter Mr. CARLOS HOFFMANN CONTRERAS. If none of the
above can accept the position, the respective arbitrator shall be appointed in
accordance with the Regulations of Centro de Arbitrajes de la Cámara de Comercio
de Santiago A.G., whose provisions are evidenced in the public deed of December
10, 1992 delivered in the Notary of Santiago of Mr. Sergio Rodríguez Garcés, and
its subsequent modifications that form an integral part of this clause, the
parties declare they know and accept. The parties shall appoint the arbitrator
ex aequo et bono by mutual agreement and in case of disagreement, the parties
grant special irrevocable mandate to Camara de Comercio de Santiago A.G., so
that, at the written request of either of them, he may appoint the arbitrator ex
aequo bono from among the members of the arbitral corps of Centro de Arbitrajes
of that Chamber and who is or has been Professor of Mining Law of any of the
Faculties of Law of the Universidad de Chile or Universidad Católica de Chile, or,
otherwise a Professor of Civil Law of any of such Faculties. There will be no
appeal against the resolutions of the arbitrator, so that the parties expressly
waive them. The Arbitrator will be especially authorized to resolve any matter
related with his competence and/or jurisdiction

25

FOURTEENTH. JURISDICTION. 

For all legal purposes that can be derived from this agreement,
the parties establish their domicile in the city of Santiago.

FIFTEENTH. FACULTY.

The bearer of a certified copy of this deed is empowered to
request the registrations, subregistrations and annotations in the Registrars
that may be relevant. Messrs. Jorge Christian Quinzio Santelices and Marcelo
Antonino Olivares Cabrera are also authorized so that either of them may correct
the errors of citation or omission in the parts where they may have incurred in
this Contract with respect to the identification of the Properties and for this
purpose may present one or more memoranda with the respective Registrar and/or
deliver or sign deeds or public or private instruments which are necessary or
convenient.

26

AUTHORITIES: The authority of Mr. FRANCISCO SCHUBERT
SEIFFERT and of Mr. MARCELO ANTONINO OLIVARES CABRERA to appear on
behalf of RIO CONDOR RESOURCES S.A. is evidenced in public deed delivered
on December 15, 2009 in the Notary of Santiago of Mrs. Antonieta Mendoza
Escalas, which is not inserted as it is known to the parties and to the
attesting Notary. 

The authority of Mr. LUIS JUAN DEPETRIS DEFLORIAN to
appear on behalf of Asesorías e Inversiones Invermondo Limitada is evidenced in
public deed delivered on March 11 2003, delivered in the Notary Public of
Santiago of Mr . Enrique Morgan Torres, which is not inserted as it is known to
the parties and to the Attesting Notary.

IN WITNESS WHEREOF, after reading, this is signed. Copy is
given.

/s/ Francisco Schubert Seiffert 
On behalf of Rio
Condor Resources S.A. 

/s/ Marcelo Antonino Olivares Cabrera 
On behalf of
Rio Condor Resources S.A. 

/s/ Mario Leoncio Contreras Villar 

/s/ Luis Juan-Depetris Deflorian 
By himself and on
behalf of Asesorias e Inversiones Invermondo 
Limitada 

27

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