could be inferred that the wordpitchblende  in the paragraph  means "a black mineral deposit."which context clue  best  confirm this meaning of the word  pitchblende? "the mine owners were happy to oblige""and dumped what was left over in a nearby pine forest""ore, it was just dirt""they had already taken out the valuable part—the metallic element"

The sentence "they had already taken out the metallic element which is the valuable part" confirms the meaning of pitchblende.

Explanation:

Pitchblende is a mineral that is a type of ''uraninite'' and it is mostly arise in ''veins'' that appears in a black color. They are affiliated with ''silver ''and it is described as the principal source of ''uranium'' and ''radium''. Due to its "black color and high density" it is known as pitchblende.

The formula for pitchblende is .Since the black mineral clue is given, the best choice would be "the metallic element which is a valuable part taken already".

for me, doing projects and performance tasks.

explanation: