Paleozoic strata exposed on Richmond Mountain define an uplifted,
west-vergent, doubly-plunging anticline with sub-vertical to overturned east-dipping
strata on the west limb and gently east-dipping strata on the east limb. Structural relief
is estimated to be as much as two kilometers, although that relief includes normal
faulting of uncertain magnitude. The west-limb strata are cut by east-dipping thrusts
originally mapped as the West Lynn Thrust system. The west-vergent thrusting on
Richmond Mountain preceded the intrusion of the Goldstrike stock and associated
dikes at approximately 159 Ma.