GRADE AND TONNAGE MODEL OF Sn SKARN DEPOSITS

By W. David Menzie and Bruce L. Reed

COMMENTS Normally a grade-tonnage model would not be built with so few deposits. However, this model is presented because tin skarn deposits are significantly different than replacement deposits in grades, tonnages, and other characteristics. Because of the small number of deposits plotted, the cumulative plot of discrete data points differes from the continuous lognormal curve. If the deposits had been plotted in descending order, the points would fall on the other side of the curve. Potential by-products from these deposits include tungsten, fluorite, beryllium, zinc, and gold. See figs. 35, 36.

Figure 35. Tonnages of Sn skarn deposits.

fig 35

Figure 36. Tin grades of Sn skarn deposits.

fig 36

DEPOSITS

Name Country

Gilliam AUQL

Lost River USAK

Moina AUTS

Pinnacles AUQL