Explained by Dennis P. Cox

On the delineation of permissive tracts

All Tertiary volcanic rocks and their extensions under less than 1 km of cover are permissive.

On the numerical estimates made

Based on the broad area of covered Tertiary volcanic rocks permissive for this deposit type, the team estimated, for the 90th, 50th, 10th, 5th, and 1st percentiles, 0, 1, 1, 1, and 2 or more deposits consistent with the grade and tonnage model of Berger and Singer (1992).

References

Ausburn, K.E., 1991, Ore-petrogenesis of Tertiary volcanic-hosted epithermal gold mineralization at the Hart mining district, Castle Mountains, NE San Bernardino County, California, in Raines, G.L., Lisle, R.E., Schafer, R.W., and Wilkinson, W.H., eds., Geology and ore deposits of the Great Basin--Symposium proceedings: Reno, Geological Society of Nevada, v. 2, April 1990, p. 1147-1188.

Berger, B.R., and Singer, D.A., 1992, Grade and tonnage model of hot-spring Au-Ag, in Bliss, J.D., ed., Developments in deposit modeling: U.S. Geological Survey Bulletin 2004, p. 23-25.

Capps, R.C., and Moore, J.A., 1991, Geologic setting of mid-Miocene gold deposits in the Castle Mountains, San Bernardino County, California, and Clark County Nevada, in Raines, G.L., Lisle, R.E., Schafer, R.W., and Wilkinson, W.H., eds., Geology and ore deposits of the Great Basin--Symposium proceedings: Reno, Geological Society of Nevada, v. 2, April 1990, p. 1195-1220.