However, the commercial extraction of coal is limited by geological faults in the area.

Falling water levels in this area have coincided with a very rapid increase in commercial extraction from the local well.

It is of no interest for commercial extraction of minerals in the near future.

The uranium content in these deposits is very low, on average less than 0.005% UO, and does not currently warrant commercial extraction.

Standlake is surrounded by numerous artificial lakes dug for the commercial extraction of gravel.

The commercial extraction of polymetallic nodules is not considered likely to occur during the next two decades.

Small amounts of natural gas and crude oil are present, often too little to merit commercial extraction.

Finally, the cost of land within the city makes commercial extraction of minerals uneconomical.

The metal is obtained as a by-product in the commercial extraction of yttrium.

Vast holdings had to be carefully delineated and mapped out, to plan the correct form of commercial extraction.