The horizontal datum used is NAD27. The ellipsoid used is Clarke 1866. The semi-major axis of the ellipsoid used is 6378206.4. Map number refers to a specific deposit in a given region. Names were derived from published sources or common usage.
Commodities are the known potentially valuable metals reported for each deposit.
Type of lode deposit is a interpretation that was made by examining the description of the deposit and then classifying the deposit using the mineral deposit type. Bulletin 1786 DGGS developed the look up table to represent these lode deposit type using a code and associated symbol. This digital data was created for mapping. This data was originally used in conjunction with the State Land Selections Project. Point features present.