NYSE HL: $5.82 -0.02 SILVER: US $23.46 -0.20 GOLD: US $1784.20 -6.40 Investors: 800.432.5291 Français Legal/Privacy Careers Contact Responsible Mining Investors Quality Assets News & Events Our Company Overview Operating Mines Pre-Development Exploration Colorado, USA Idaho, USA Nevada, USA Washington, USA British Columbia, Canada Quebec, Canada Durango, Mexico San Sebastian Overview & History Geology & Mining PEA Summary Production Reserves & Resources Exploration Future Plans San Sebastian Durango, Mexico San Sebastian is a silver and gold mine, with the most recent mining beginning in December 2015. Mining of ore was completed in the third quarter of 2020 and milling was completed in the fourth quarter of 2020. Hecla’s concession holdings at San Sebastian are located in the middle of the prolific Mexican Silver Belt and cover approximately 42,000 hectares (162 square miles). Within this land position is the Francine Vein, Hugh Zone, Middle Vein and Don Sergio-Andrea vein systems as well as multiple prospective exploration targets. In 2020, prior to completion of operations, San Sebastian produced 954,772 ounces of silver at a cash cost, after by-product credits, per silver ounce of $4.92 (a non GAAP measure) and 7,233 ounces of gold. (1). (1) Cash cost, after of by-product credits, per silver ounce represents a non-GAAP measurement, a reconciliation of which to cost of sales and other direct production costs and depreciation, depletion and amortization (GAAP) can be found in the legal page of this website. Aviso de Privacidad PDF Overview & History The Saladillo mining district is located 90 km northeast of the city of Durango, Mexico, near the border of the state of Durango and Zacatecas. The district was discovered in 1995 and acquired by Hecla through the purchase of Monarch Resources in 1999. The Francine Vein was originally developed and put into production by Minera Hecla producing gold and silver from 2001 to 2005. During that time, the district produced 494,848 tonnes of ore containing 186,951 ounces of Au and 12.4 million ounces of Ag with an average grade of 11.7 g/t (0.34 oz/ton) Au and 777 g/t (22.7 oz/ton) Ag, making it one of the highest-grade producers in Mexico. Hecla geologists have long recognized the potential for the district to host similar high-grade mineralization, and a systematic, ongoing exploration effort has been in place since Hecla took control of the district in 1999. Much of the initial exploration work in the Cerro Pedernalillo area was focused on the Don Sergio Au-Ag Vein, which was developed by Minera Hecla from 2003 to 2005. This mine produced 55,677 tonnes of ore containing 27,066 ounces Au and 187,044 ounces Ag, with an average grade of 15.1 g/t (0.44 oz/ton) Au and 104 g/t (3.03 oz/ton) Ag. Renewed drilling in 2011-2012 added mineral resources to the Andrea Vein. The Hugh Zone Resource (deeper Francine Vein) was discovered in 2004 and contains a polymetallic (Ag-Au-Cu-Pb-Zn) resource. A bulk sample was mined to test longhole stoping and flotation milling results in 2019 and 2020. An update to the Hugh Zone scoping study was completed in 2020. The Middle Vein and North Veins are in the footwall of the Francine Vein. The East Francine Vein is located northeast of the Francine Vein and is interpreted to be a fault offset portion of the Francine Vein. Additional Resources were added at the Middle, North and East Francine veins during the period of 2012 to 2015 and open-pit mining on these veins began in late 2015. Renewed underground mining began in January 2018 on the Middle Vein. The El Toro Au-Ag Vein area was discovered under soil cover in late 2018 by a combination of Short Vertical Reverse Circulation (SVRC) drilling and follow-up conventional RC drilling and core drilling and a mineral resource has been identified. Some definition core drilling was focused in this area during 2020. Two new veins were discovered in 2020 as a result of the SRVC program: The El Tigre and El Bronco Veins. Exploration drilling continues on these veins to develop a mineral resource on one or both of these structures. Mining was discontinued during 2020 and reclamation activities are in progress. San Sebastian currently has no mineral reserves but contains 14.9 million ounces of measured and indicated silver resources and 17.2 million ounces of inferred silver resources. In addition, there are 148,700 ounces of measured and indicated gold resources as well as 132,700 ounces of inferred gold resources. Mineralization in the district is structurally controlled and hosted in sedimentary rocks. Historical production from the Francine vein (2001 to 2005) was from a high-grade silver vein with significant gold mineralization. Production from the Don Sergio vein was from a near-surface, high-grade gold vein with known silver mineralization. Geology & Mining Mineralization in the district is structurally controlled and hosted in sedimentary rocks. Production to date has been from high-grade vein systems focusing on shallow, near-surface open pit and underground mining methods. The Company used a contractor for open-pit and underground mining operations and secured the use of a Merrill-Crowe processing plant near Velardeña, Durango for the most recent mining phase. Located within 100 miles of San Sebastian, the mill was previously used by Hecla to process ore when it mined on the property from 2001 to 2005. The mill was updated to meet the standard Hecla uses for environmental protection and best practices in milling standards. Production (year ended December 31) 2016 2017 2018 2019 2020 Silver (ounces) 4,294,123 3,257,738 2,037,072 1,868,884 954,772 Gold (ounces) 34,042 25,177 14,979 15,673 7,223 Cash cost per silver ounce, after by-product credits, ($/oz) (1) $(3.35) $(3.36) $9.69 $8.02 $4.92 (historical, years ended December 31) 2001 2002 2003 2004 2005 Silver (ounces) 950,002 3,432,394 4,085,038 2,042,173 717,860 Gold (ounces) 15,983 41,510 47,721 33,563 17,160 (footnotes) Reserves & Resources Information with respect to proven and probable ore reserves, measured, and inferred resources is set forth below. (footnotes) 2020 Reserves & Resources PDF Exploration San Sebastian exploration is currently focused on advancing multiple high-priority targets in the district as well as the El Tigre and El Bronco veins discovered under thick soil cover in 2020. So far, the El Tigre and El Bronco veins are strong structures that in places have over 28 feet of true thickness, almost a mile of strike length down to 1,000 feet below the surface, and are open for expansion. Future Plans The Company continues to explore this highly prospective land package and will evaluate further mining based on exploration results. Investor Kit Annual Report Corporate Presentation Investor Fact Sheet Receive Email Alerts Quarterly Results 11.04.2021 Hecla Reports Third Quarter 2021 Results view all Current News 11.09.2021 Hecla to Present at the RBC Global Mining Conference and CEO Webcast on Q3 Performance view all subscribe Events & Webcasts 11.17.2021 Hecla Mining Company at RBC Global Mining and Materials Conference view all © 2021 Hecla Mining Company