The Science: Technology: Mining: (Prospecting Mining )

Prospecting is the act of searching for valuable metals in either bearing veins, or placer gravels, which have been eroded from the original vein in which they were formed. If sufficient amounts are found via prospecting, then mining can begin to extract them. Prospecting Mining Technology Science.

Once a small occurrence or show was found, it was then necessary to intensively work the area with pick and shovel, and often via the addition of some simple machinery such as a sluice box, races and winnows, to work the loose soil and rock looking for the appropriate materials (in this case, gold). (wikipedia)