Mr. Luis Castro reports

ENDEAVOUR SILVER INTERSECTS HIGH-GRADE SILVER-GOLD MINERALIZATION AT THE GUANACEVI MINE IN DURANGO, MEXICO

Endeavour Silver Corp. has intersected high-grade silver-gold mineralization in its 2021 exploration drill program to expand the El Curso orebody at the Guanacevi mine in Durango state, Mexico. The company is currently producing from three orebodies at Guanacevi: Milache, El Curso and SCS. Exploration drilling is continuing at El Curso and SCS.

Highlights from the latest drill results include:

• 3.27 grams per tonne gold and 2,753 g/t silver for 2,982 g/t silver equivalent (AgEq at a 70:1 silver:gold ratio) over a 4.1-metre true width (87.0 ounces per short ton AgEq over 13.5 feet), including 0.6 g/t gold and 18,752 g/t silver for 18,794 g/t AgEq over 0.3 m (548.2 oz/t AgEq over 1.0 ft) in drill hole UCM-48;
• 4.29 g/t gold and 3,464 g/t silver for 3,764 g/t AgEq over a 2.6 m true width (109.8 oz/t AgEq over 8.5 feet), including 25.7 g/t gold and 19,390 g/t silver for 21,189 g/t AgEq over 0.3 m (618.0 oz/t AgEq over 1.0 ft) in drill hole UCM-50.

Luis Castro, vice-president of exploration, commented: "We continue to intersect excellent drill results as we step out from the current margins of the El Curso orebody. There remains an additional 100 m to drill until we connect El Curso with the Milache orebody to the west, and there is a similar gap to fill to connect El Curso with the Porvenir Cuatro orebody (previously mined) to the east.

"Ultimately, we anticipate that Porvenir Cuatro, El Curso and Milache will all connect to form one continuous orebody over a 1,500 m length by 400 m vertical extent. This would make it comparable to the original Porvenir Norte orebody, which supported production at Guanacevi for over 14 years. The future is looking bright for Guanacevi."

                                  DRILL RESULTS SUMMARY

Hole               From      True width              Au              Ag            AgEq
                    (m)             (m)           (g/t)           (g/t)           (g/t)

UCM-43           235.35             1.1            1.50             518             623
                 236.85             0.2            3.82           1,069           1,336
UCM-44           251.15             1.6            1.31             530             622
                 253.75             0.3            4.02           1,361           1,642
UCM-45           270.25             2.2            1.27             572             661
                 272.55             0.2            5.60           2,304           2,696
UCM-46           139.00             1.0            2.43              39             209
                 139.00             0.5            3.73              18             279
UCM-47           133.60             3.3            2.54           2,014           2,191
                 136.10             0.5            4.23           4,223           4,519
UCM-48           151.70             4.1            3.27           2,753           2,981
                 157.80             0.3            0.60          18,752          18,794
UCM-50           131.20             2.6            4.29           3,464           3,764
                 133.70             0.3           25.66          19,390          21,186
UCM-51           148.00             1.4            0.48             235             269
                 148.00             0.3            0.89             328             391
UCM-53           207.00             1.1            0.62             179             222
                 208.00             0.2            3.47             952           1,195
UCM-55           230.25             3.0            1.09             420             496
                 232.45             0.5            1.79             856             981
UCM-56           253.30             4.6            0.95             401             467
                 257.45             0.4            2.12             887           1,036
UCM-57           239.25             2.9            0.50             275             310
                 240.50             0.3            2.06             741             885
UCM-58           220.65             2.6            2.67           1,120           1,307
                 222.00             0.4            8.09           2,936           3,502
UCM-59           304.85             2.0            1.76           1,180           1,303
                 305.35             0.2            7.31           5,832           6,343
UCM-63           202.95             6.9            1.86             759             889
                 210.70             0.3            9.56           4,292           4,961
UCM-64           226.60             1.3            0.58             210             250
                 226.60             0.2            0.77             301             355

Silver equivalents are calculated at a ratio of 70:1 silver:gold. 
All widths are estimated true widths. 

 

Qualified person and quality assurance/quality control

Dale Mah, PGeo, 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 and split and 250-gram pulp samples are prepared for analysis. Gold is determined by fire assay with an atomic absorption (AAS) finish and silver by aqua regia digestion with ICP (inductively coupled plasma) finish, overlimits by fire assay and gravimetric finish.

About Endeavour Silver Corp.

Endeavour Silver is a mid-tier precious metals mining company that owns and operates three high-grade, underground, silver-gold mines in Mexico. Endeavour is currently advancing the Terronera mine project toward a development decision and exploring its portfolio of exploration and development projects in Mexico and Chile to facilitate its goal to become a premier senior silver producer. The company's philosophy of corporate social integrity creates value for all stakeholders.

We seek Safe Harbor.