Endeavour Silver Corp. (TSX: EDR) (NYSE: EXK) is pleased to report positive drill results from its exploration program at the Bolañitos Mine in Guanajuato State, Mexico. The 2023 program mainly focused on two areas, drilling the El Puertecito and Fortuna veins. At both areas, surface drilling intersected high-grade gold and silver mineralization near historic workings and provide opportunities to increase resources, replace reserves and extend mine life.

Dan Dickson, CEO, commented, “Our track record of exploration success has sustained operations at Bolañitos for over 16 years. Ongoing exploration results demonstrate our commitment to targeted and cost-effective brownfields exploration, which has been successfully extending mine life in this historically rich district. We continue to make progress year over year in understanding the regional mineralization system and remaining prospectivity at Bolañitos.”

Highlight Drill Results from El Puertecito Vein Structure

• 8.78 gpt Au and 86 gpt Ag for 788 gpt AgEq over a 2.09 m ETW, including 25.7 gpt Au and 59 gpt Ag for 2,115 gpt AgEq over 0.57 m in hole GOL-11
• 4.44 gpt gold and 94 gpt silver for 449 gpt AgEq over a 2.07 m ETW, including 11.35 gpt Au and 258 gpt Ag for 1,166 gpt AgEq over 0.56 m in hole GOL-09

Highlight Drill Results from Fortuna Vein Structure

• 4.01 gpt Au and 135 gpt Ag for 456 gpt AgEq over a 1.18 m ETW, including 8.04 gpt Au and 280 gpt Ag for 923 gpt AgEq over 0.56 m in hole GOL-42

Abbreviations include: gpt: grams per tonne; Au: gold; Ag: silver; ETW: estimated true width; m: metre; HW: hanging wall. Silver equivalents are calculated at a ratio of 80:1 silver:gold.

Drilling Context

At El Puertecito, since the beginning of the year, 32 new holes were completed totalling 5,833 metres. El Puertecito is a new area south of Bolañitos, situated 300 metres northeast from Endeavour Silver’s historic Golondrinas Mine. Due its proximity to existing infrastructure, minimal development would be required to incorporate El Puertecito into a mine plan. New high-grade vein mineralization has now been delineated over 400 metres in length to a depth of 120 metres.   The structure remains open at depth and to the southeast.

At Fortuna, 13 holes were completed totalling 2,922 metres. Fortuna is located south of Bolañitos situated 200 metres from current accesses to the Lana vein of Endeavour Silver’s Lucero mine. Two structures have been delineated to define a mineralized zone of 250 metres in length and 100 metres to depth, open to the southeast.

Latest Drill Results

The Bolañitos drill results are summarized in the following tables:

El Puertecito Vein:

Note: Drill holes GOL-04, GOL-05, GOL-12, GOL-13, GOL-14, GOL-16, GOL-18, GOL-19, GOL-21, GOL-22, GOL-24, GOL-26, GOL-29, GOL-32, GOL-33, GOL-43 and GOL-44 returned no significant results

Fortuna Vein:

Note: Drill hole GOL-51 returned no significant results

Silver equivalents are calculated at a ratio of 80:1 silver:gold. All widths are estimated true widths.

Qualified Person and QA/QC – Dale Mah, P.Geo., Vice President Corporate Development of Endeavour Silver, is the Qualified Person who reviewed and approved the technical information contained in this news release. A quality control sampling program of reference standards, blanks and duplicates has been instituted to monitor the integrity of all assay results. All samples are split at the local field office and shipped to SGS Labs, where they are dried, crushed, split and 250 gram pulp samples are prepared for analysis. Gold is determined by fire assay with an atomic absorption finish and silver by aqua regia digestion with ICP finish, over-limits by fire assay and gravimetric finish.

About Endeavour Silver

Endeavour is a mid-tier precious metals mining company that operates two high-grade underground silver-gold mines in Mexico. Endeavour is advancing construction of the Terronera Project and exploring its portfolio of exploration projects in Mexico, Chile and the United States to achieve its goal of becoming a premier senior silver producer.  Our philosophy of corporate social integrity creates value for all stakeholders.