stope

Underground mining was proactively paused on July 3 to allow for the installation of additional controls to further protect workers in the event water entered the mine through an historic stope at the Cochenour complex which is part of Red Lake.

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NORDIC BUSINESS REPORT-June 27, 2019-Lundin Gold begins mining of first production stope at Fruta del Norte project

The structural parameters of the stope are closely related to its productivity and recovery rate, as well as the stability of the goaf.

But coal body in the stope is under dynamic loading induced by the bending and breaking of the overlaying strata, which weakens the mechanical properties of coal body and continuously transfer the mining stress inside the coal body [6].

Using a stoping dilution at 20% @ 1.65g/t Au and a stope recovery of 85% mining studies estimated an extraction of 63% of this resource from development and stoping (2.895 million tonnes at 4.2g/t Au for 390,000 ounces).

Some of the bar and arm drills have been mounted on skids to facilitate their movement from stope to stope, carried by an LHD.

Tiny ([greater than] 0.5 mm) black blades of acanthite associated with minor native silver in massive quartz were found on some specimens from the 4560 stope. However, these are suspected to be "cabinet growth" on samples left in storage for some time before being unwrapped and examined.

The geotechnical assessment supports the conventional long-hole stoping mining method including the use of longitudinal and transverse stopes, 30m level spacing, and the nominal stope strike length of 15m-30m.

The company is continuing new development work in advancing the main ramp with one jumbo advancing the main ramp toward the 5600 level and another jumbo working on stope development.