Operations

Overview

The NX Gold Mining Complex is located in southeastern Mato Grosso State, Brazil, approximately 670 km east of the capital city of Cuiabá. The NX Gold Mining Complex consists of fully integrated underground mining and processing facilities. The high-grade, shear-zone hosted, quartz vein system is accessed via a single decline, and current mining operations are focused on the Santo Antônio vein. Ore is processed using a conventional three-stage crushing circuit, milling, and a combination of gravity concentration and intensive leaching and flotation followed by carbon in leach at the Nova Xavantina Mill, located adjacent to the NX Gold underground mine.

Near mine exploration activities are focused down-plunge of the Santo Antônio, Matinha, Brás and Buracão veins. In early 2021, the first regional exploration program commenced, focused on the on the under-explored, 31,716 hectare land package held by NX Gold.

In August 2021, RGLD Gold AG, a wholly owned subsidiary of Royal Gold, Inc., purchased a $110 million gold stream on the NX Gold Mine in exchange for 25% of gold produced from the NX Gold Mine until 93,000 ounces of gold have been delivered, decreasing to 10% of gold produced over the remaining life of mine. RGLD Gold AG will make ongoing payments equal to 20% of the prevailing spot gold price for each ounce of gold delivered until 49,000 ounces of gold have been received, after which it will pay 40% of the prevailing spot gold price for each ounce of gold delivered. Full details of the transaction can be found in the Company’s press release dated June 30, 2021.

Classification

Tonnage
(000 tonnes)

Grade
(gpt Au)

Au Contained
(000 ounces)

Reserves

 Probable, Santo Antonio Vein

958

9.01

277.5

 Probable, Matinha Vein

146

6.26

29.4

Total Probable

1,104

8.64

306.8

Resources (including Reserves)

 Indicated, Santo Antonio Vein

950

10.56

322.4

 Indicated, Matinha Vein

124

8.55

34.1

 Indicated, Brás & Buracão Vein

7

3.36

0.7

Total Indicated

1,081

10.28

357.3

 Inferred, Santo Antonio Vein

248

2.99

23.9

 Inferred, Matinha Vein

310

10.47

104.2

 Inferred, Brás & Buracão Vein

157

4.71

23.8

Total Inferred

714

6.61

151.9

Mineral Reserve & Resource Notes:

  1. Mineral reserve and mineral resource estimates are effective as at September 30, 2021.
  2. Presented mineral resources inclusive of mineral reserves. Indicated mineral resource totals are undiluted. All figures have been rounded to the relative accuracy of the estimates. Summed amounts may not add due to rounding.
  3. Grade-shell 3D models using 1.20 gram per tonne ("gpt") gold were used to generate a 3D mineralization model of the NX Gold Mine. Mineral resources were estimated using ordinary kriging within 2.5 meter by 2.5 meter by 0.5 meter block size. Mineral resource were constrained using a minimum stope dimension of 2.0 meters by 2.0 meters by 1.5 meters and a cut-off of 1.90 gpt based on a gold price of US$1,900 per ounce of gold. The mineral resource estimates were prepared in accordance with the Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) Definition Standards for Mineral Resources and Mineral Reserves, adopted by the CIM Council on May 10, 2014 (the “CIM Standards”), and the CIM Estimation of Mineral Resources and Mineral Reserves Best Practice Guidelines, adopted by CIM Council on November 23, 2003 (the ‘CIM Guidelines”), using geostatistical and/or classical methods, plus economic and mining parameters appropriate to the deposit.
  4. Mineral reserve estimates were prepared in accordance with the CIM Standards and the CIM Guidelines, using geostatistical and/or classical methods, plus economic and mining parameters appropriate for the deposit. Mineral reserves are based on a long-term gold price of US$1,650 per ounce (“oz”), and a USD:BRL foreign exchange rate of 5.00. Mineral reserves are the economic portion of the Indicated mineral resources. Mineral reserve estimates include operational dilution of 17.4% plus planned dilution of approximately 8.5% within each stope for room-and-pillar mining areas and operational dilution of 3.2% plus planned dilution of 21.2% for cut-and-fill mining areas. Assumes mining recovery of 92.5% and 94.7% for room-and-pillar and cut-and-fill areas, respectively. Practical mining shapes (wireframes) were designed using geological wireframes / mineral resource block models as a guide.

Mineral resources which are not mineral reserves do not have demonstrated economic viability.

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