It has forecast a 20% increase in production to 10.2-11.2 million silver-equivalent ounces this year, with its fourth silver-gold mine in Mexico expected to start commercial production later this month.

Silver production for the June quarter was 19% higher than the previous corresponding period at 1.35 million ounces, and gold was 5% higher at 13,674oz, equating to 2.4Moz AgEq.

Endeavour said the improvement was mainly due to higher output and grades at El Cubo.

"El Cubo is currently performing ahead of plan and Guanacevi is still lagging behind plan but with mine development up in Q2, 2018, and the Milache orebody coming into production, Guanacevi mine output should improve in Q3, 2018," CEO Bradford Cooke said.

Endeavour expects its fourth mine, El Compas, to be the "main driver" of increased production in the second half.

The high-grade mine is expected to produce 1Moz AgEq annually.

Cooke also expected several catalysts this quarter to move the company's fifth and largest mine project, Terronera, to a development decision.

He said an optimised feasibility study was forthcoming, the final two environmental permits were expected shortly and an initial debt facility was being prepared.

Terronera is expected to produce an initial 2.5Moz AgEq, doubling to 5Moz in two years, according to a 2017 prefeasibility study.

The company had announced a US at-the-market offering last month to raise up to US$35.7 million to progress Terronera.

Endeavour shares closed down yesterday, off 4.4% in Toronto to C$4.13 and down 5.44% in New York to US$3.13, but remain near the 52-week highs reached this month.