For a rock to be considered an ore, it must:
A) contain either quartz or sulfide minerals
B) contain enough of a commodity to be mined at a profit
C) contain some copper or gold
D) be shiny or otherwise noteworthy
E) be located in a mine

Question

Quizplus · Accepted Answer

For a rock to be considered an ore, it must contain enough of a commodity (such as minerals or metals) that it can be mined at a profit. This is what differentiates ore from simply being a rock or mineral. The presence of specific minerals like quartz or sulfide, copper, gold, physical characteristics like shininess, or the location of the rock does not solely determine its classification as an ore.

For a Rock to Be Considered an Ore, It Must