How to Test a Rock for Gold | Sciencing
Mar 13, 2018· How to Test a Rock for Gold ... It is malleable, which means it can be dented, and it has a brassy yellow color. This type of gold may even have quartz or other mineral material still attached to it. Crush the Rock. California miners in the 1840s used sluice boxes to siphon gold from sand or crushed rock, and hobbyist gold miners use the same ...