The first and most important thing of the sampling process is to try to be as unbiased as possible. There is a natural tendency to select rock that looks the best—even unconsciously.

In this continuation of the Midwest gold series we are going to take a look at the states of Iowa, Missouri, and Kansas, look at possible locations within these states to find gold and talk about areas where gold has been found in the past.

Old tailing piles extend for miles. There was still plenty of water flowing here, so WPA members set up highbankers at several settling ponds.

Ultraviolet light is divided into three levels, labeled A, B and C depending on the wavelength, with C having the shortest wavelength and the most energy.