A coal deposit that is not economical to mine today would be considered part of our __________ . d) none of thesea.coal reservesb.coal resourcesc.coal reservoirsd.None of these

The correct answer is b. coal resources.

Here's why:

a) Coal reserves: These are coal deposits that can be mined profitably right now with the current technology and prices. Since the coal deposit in question is not economical to mine today, it cannot be considered a coal reserve.

b) Coal resources: These are coal deposits that are known to exist and are potentially valuable, but for some reason cannot be mined profitably right now. This could be due to a variety of factors, such as current technology limitations, market prices, or accessibility issues. Since the coal deposit in question is not economical to mine today, it would be considered a coal resource.

c) Coal reservoirs: This term is not typically used in the context of coal deposits.

d) None of these: This option is incorrect because the coal deposit in question would be considered a coal resource, as explained above.