The Endeavor Mine is a major underground zinc/lead/silver mining operation in central New South Wales, 46 kilometres north of the town of Cobar and 700 kilometres from Sydney.

Operations commenced in 1983 and comprise an underground mine accessed by both decline and haulage shaft, and serviced by a concentrator, drying, storage and rail facilities.

CBH has upgraded the mine to establish a consistent through put rate of 1.2Mtpa, lower the operating costs and increase metal recoveries. An important phase of the upgrade was the installation of a pastefill plant to achieve a mine life of 15 years through full extraction of current ore resources. The use of paste backfill will enable the mining of large blocks of high grade ore developed in previous mining and enable a more flexible mine plan able to build production capacity to 1.4Mtpa.

Ore haulage has been improved through the introduction of road trains with ore delivery direct to the surface to achieve both increased mine production and a lowering of costs. A new decline has been constructed so that ore haulage in the upper 300 meter section of the mine is not constrained.

The processing plant has been undergoing progressive upgrade and improvements to circuits and can now support a through put rate of 1.4Mtpa with an increased zinc recovery of 85%. A copper circuit has been added to enable production of a copper concentrate.