Visitors are allowed to collect mineral specimens in several areas of the former mine's tailings.
It includes important ore minerals, pegmatite, volcanic rocks, and others.
The main display is 32 feet long and it is unsurpassed in the world for the variety of its colors.
Indian room – there are numerous Native American artifacts, including the collection of stone tools made by the Lenni Lenape Indians, the earliest inhabitants of what later became New Jersey.
The collection contains artifacts from all over the United States and Mexico, and includes tools such as axes, spear heads, and knives, as well as some pottery and baskets.