2)What is meant by economic and non-economic deposits of natural resources?

To be listed as an economic deposit, two conditions must be met. The first is the cost of extraction (mining) the ore or mineral must be low enough to produce a profit. The second is that the size of the deposit must be large enough to sustain mining over a long enough period of time to make mining worthwhile.

A non-economic deposit is any mineral deposit which these two conditions have not been met. This might be because the size of the deposit is not known or is known to be too small or that the deposit cannot be mined at a profit (too deep or not rich enough at common market values).

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