JT Deposit

The JT Deposit hosts an Indicated Resource of 3.489 Mt grading 9.39 g/t gold equivalent (“AuEq”) comprised of 5.33 g/t Au, 6.0 g/t Ag, 0.56% Cu, 0.67% Pb and 5.21% Zn. The Inferred Resource of 0.706 Mt grading 4.76 g/t AuEq is comprised of 1.36 g/t Au, 9.1 g/t Ag, 0.59% Cu, 0.30% Pb, and 4.18% Zn.

The high-grade Indicated Resource forms an average 40-m thick sub-vertical, tabular structure highly amenable to low-cost, bottom-up, bulk underground mining techniques. This exceptional width is 10x that of high-grade (>5 gpt AuEq) peers.

Locked cycle flotation tests yielded very high-quality copper, zinc, lead and gold concentrates produced at a coarse primary grind with very good metal recoveries, low impurities, and negligible penalty elements. Highlights include:

  • Gold recovery of 97.2% combined total of payable gold to concentrates and leaching of tails.
  • Zinc recovery of 92.3% to a concentrate grading 52.6% zinc.
  • Copper recovery of 84.5% to a concentrate grading 30.6% copper.
  • Lead recovery of 72.4% to a concentrate grading 62.1% lead.
  • Gold pyrite concentrate grading 64.3 g/t gold.
  • Coarse primary grind size of 125 microns.

The JT Deposit is interpreted as an intermediate sulfidation epithermal deposit with volcanogenic massive sulfide (VMS) characteristics. Mineralization at the main JT Deposit forms a tabular silicified body that contains a stockwork of quartz-sulphide veins and breccia surrounded by a widespread zone of anhydrite-chlorite alteration, outboard to a widespread zone of pyrite-sericite alteration. Drilling has defined silicification and mineralization from surface to a vertical depth of approximately 350 meters, over a total strike length of over 600 meters, and to a maximum true width of 60 meters.

The JT Deposit is truncated to the southeast by the northeast striking, 5–10 m Dacite Fault. The hanging wall to the Dacite Fault is relatively unaltered quartz-feldspar porphyry, suggesting that part of the deposit has been offset. This offset remains a priority exploration target.

HighGold continues to grow and build value at the JT Deposit, which is open in multiple directions, while also advancing engineering, technical studies, and permitting in support of advanced exploration and evaluation. These include designs and permitting for an expanded airstrip to accommodate aircraft that can carry large equipment, underground access to the base of the current JT deposit to both expand and upgrade the resource, and a road to a barge landing site at the coast.

Resource Estimate

Table 1. JT Deposit Mineral Estimate at 3.0 g/t AuEq Cut-off
(effective date July 12, 2022)
Category Tonnes
(000s)
Au
(g/t)
Ag
(g/t)
Cu
(%)
Pb
(%)
Zn
(%)
AuEq
(g/t)
Indicated 3,489 5.33 6.0 0.56 0.67 5.21 9.39
Inferred 706 1.36 9.1 0.59 0.30 4.18 4.76
Contained Metal
Category   Au
(koz)
Ag
(koz)
Cu
(M lb)
Pb
(M lb)
Zn
(M lb)
AuEq
Indicated   598 673 43.1 51.5 400.8 1,053
Inferred   31 207 9.2 4.7 65.1 108

Notes

  1. Includes all drill holes completed at JT Deposit, with drilling completed between 1982 and as recently as October 2021
  2. Assumed metal prices are US$1650/oz for gold (Au), US$20/oz for silver (Ag), US$3.50/lb for copper (Cu), US$1.00/lb for lead (Pb), and US$1.50/lb for zinc (Zn)
  3. Gold Equivalent ("AuEq") is based on assumed metal prices and an estimated metallurgical recovery of 97% for Au, 85% for Ag, 85% for Cu, 72% for Pb, and 92% for Zn based on metallurgical testwork completed in 2022
  4. AuEq equals = Au g/t + Ag g/t × 0.01 + Cu% × 1.27 + Pb% × 0.31 + Zn% × 0.59
  5. An average bulk density value of 2.84 was used as determined by conventional analytical methods for assay samples
  6. Capping was applied to assays to restrict the impact of high-grade outliers, resulting in the removal of 8.4% Au, 10.1% Ag, 2.8% Cu, 6.2% Pb, and 1.3% Zn from the resource block model as compared to an uncapped version.
  7. The economic underground mining cut-off is estimated to be 2.5g/t AuEq derived from the assumed operating cost of $65/t for long hole stope mining, $35/t processing and $20/t G&A and accounting for transport and smelter charges. HighGold elected to report this mineral resource at a higher cut-off grade of 3.0g/t Au, given the high-grade nature of the deposit.
  8. Preliminary underground constraints were applied, including the elimination of isolated or scattered blocks above cut-off grade to define the "reasonable prospects of eventual extraction" for the Mineral Resource Estimate.
  9. Mineral resources are reported as undiluted.
  10. Mineral resource tonnages have been rounded to reflect the precision of the estimate
  11. Readers are cautioned that mineral resources that are not mineral reserves do not have demonstrated economic viability

Property Map

JT Property Plan Map

JT Deposit Long Section



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