The estimated ore reserve was 1.54 billion tons.

It possesses the biggest ore reserve of the country.

Proper mining practice calls for the average ore reserve grade and average stone size.

It's all the strategy of spin, as were the promises of good times to come and the announcement of vast new copper and iron ore reserves estimates.

However, the community was abandoned by 1998, when the ore reserves were depleted enough that the mines were no longer profitable.

The town grew up around the smelter that was built to process ore from the canyon's mines.

It was built in 1891 to process ore mined from the mountains around the city into silver through lixiviation.

The process, like heap leaching, makes it possible to process ore profitably that otherwise would not qualify as mill-grade.

The mill was built at the entrance of the tunnel to process ore from the many mines drained by the tunnel.

A government battery was built to process ore from small mines.

The silver represents tin, the black raw ore.

Once the raw ore was removed from the mine, it would be crushed, then washed.

The first ore shipment was sent to smelters with about twenty tons of raw ore containing silver, lead and zinc.

World production averages two billion metric tons of raw ore annually.

The mining operation in the town was comparatively large, starting with mining the raw ore and finishing with an end product of pure copper anode.