Sunshine Silver Mining & Refining is targeting a late-2028 return to production at Idaho’s historic Sunshine Mine, while designing a larger operation and evaluating a return to integrated silver and antimony refining.
Speaking with Kitco Mining’s Paul Harris at the 2026 Mining Forum Americas, CEO Heather White said Sunshine’s June IPO raised about $310 million gross, providing the runway to complete key development work ahead of a targeted Q2 2027 feasibility study. The company is now evaluating a 2,000-tonne-per-day mill, double the roughly 1,000-tonne-per-day base case, as it plans for higher future throughput and resource growth.
Sunshine hosts about 104 million ounces of indicated silver resources at 1,022 g/t and another 160 million ounces inferred at 776 g/t. White said the mine’s ultra-high grade supports a low-cost operating profile, with additional copper, antimony and lead byproducts providing further potential credits.
The company is also evaluating whether to restart its silver-copper refinery and develop a new antimony plant. If advanced, Sunshine says the antimony facility could produce up to 34.5 million lb annually, potentially supplying as much as 60% of annual U.S. demand.
Beyond the restart, Sunshine expanded its Silver Valley land position by 60% to roughly 38,000 acres in September and launched a 45,000-meter district-scale exploration program as management evaluates broader multi-mine potential.
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00:19 - $310M IPO Funds Sunshine’s Next Development Phase
00:59 - 1,000 g/t Silver Grades and Low-Cost Potential
04:01 - Targeting a Late-2028 Return to Production
05:42 - Funding Runway, Capex and the Next Financing Decision
07:12 - Sell Concentrates or Restart Refining?
08:17 - Why Sunshine Is Planning a 2,000 TPD Mill
10:09 - Permits, Safety and Environmental Track Record
11:30 - Silver, Antimony and U.S. Critical Minerals
15:10 - 38,000 Acres, 45,000m Drilling and Multi-Mine Potential
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