The sample I had sent in for assay was taken from the surface a weathered sample with minerals leached out over time, a poor representation of the ore body. The deeper one goes the richer the ore.

A list of the minerals of interest from that chunk of hard clay.

Gallium
Hafnium
Dysprosium
Scandium
Niobium
Neodymium
Lithium
Lanthanum
Hahnium
Samarium