4. Mineral Properties


	At March 31, 2019		At December 31, 2018
Mt Todd, Australia	$	2,146	$	2,146
Guadalupe de los Reyes, Mexico		175		275
	$	2,321	$	2,421

During October 2017, we entered into an agreement (the “Option Agreement”) to option our interest in the Guadalupe de los Reyes gold and silver project in Sinaloa, Mexico (the “GdlR Project”) to Minera Alamos Inc. and its subsidiary Minera Alamos de Sonora S.A. de C.V. (“Minera Alamos”).

Pursuant to the terms of the Option Agreement, we granted Minera Alamos an exclusive right and option right to earn a 100% interest in the GdlR Project by:

making payments totaling $6,000 comprised of a payment of $1,500 made at the execution of the Option Agreement (“Option Grant Date”); two successive payments of $1,500 each to be made at the one-year and two-year anniversaries of the Option Grant Date; and a final $1,500 payment to be made before the four-year anniversary of the Option Grant Date;

maintaining the concessions comprising the GdlR Project in good standing;

fulfilling all of our obligations to the Ejido La Tasajera (the “Ejido”) as set out in the temporary occupation contract between us and the Ejido;

granting us a capped net smelter return (“NSR”) on production from open pit mining (the “Open Pit NSR”) at rates that range from 1% (at gold prices of $1,400/oz or less) to a maximum of 2% (at gold prices above $1,600/oz) up to an aggregate of $2,000 in royalty payments;

granting us a perpetual NSR on production from underground mining (the “Underground NSR”) at rates that range from 1% (at gold prices of $1,400/oz or less) to a maximum of 2% (at gold prices above $1,600/oz); and

granting us the right to assume a 49% non-carried interest in an underground project if Minera Alamos decides to develop an underground mine at the GdlR Project (the “Back-in Right”).

The Option Agreement provides that all cash payments are non-refundable and optional to Minera Alamos, and in the event Minera Alamos fails to pay any of the required amounts as set out in the Option Agreement, or fails to comply with its other obligations, the Option Agreement will terminate and Minera Alamos will have no interest in the GdlR Project. Provided it is not in breach of the Option Agreement, Minera Alamos may at its discretion advance the above payment schedule.

Subject to Minera Alamos timely making all the option payments, and fulfilling its other obligations with respect to the Option Agreement, we will transfer 100% of the shares of the Company’s 100% owned subsidiary Minera Gold Stake S.A. de C.V., the entity which owns the GdlR Project, to Minera Alamos and the Open-Pit NSR and Underground NSR will be granted to us.

If Minera Alamos discovers, and decides to develop, an underground mine at the GdlR Project and we exercise the Back-in Right, we and Minera Alamos have agreed to form a joint venture to develop and operate the underground mine. If the joint venture is formed, the Underground NSR will terminate.

The Company has determined that control of the GdlR Project has not been transferred for accounting purposes. The first option payment of $1,500 received in October 2017 has been accounted for as reduction to carrying value. Subsequent option payments received, if any, will be accounted for as further reductions to carrying value. After the carrying value has been reduced to zero, remaining option payment proceeds, if any, will be recognized as a contract liability until control of the GdlR Project has transferred to the buyer or the Option Agreement has been terminated. In addition, in accordance with our policy, potential royalty revenue and future option payments have been fully constrained.

In October 2018, the Company agreed to extend the due date for the second $1,500 option payment for the GdlR Project by six months to April 23, 2019, at which time the payment was made. As consideration for the deferral, the Company received an additional $150 in cash, $50 of which was paid to Vista on October 24, 2018 and $100 of which Minera Alamos paid on January 23, 2019. In addition, Minera Alamos paid interest at a rate of 1.5% per month on the unpaid balance of the $1,500 payment beginning January 24, 2019. See also Note 10.