ozs.

With gold and silver ores, the proportion of precious metal is small, and it is necessary to carry the reduction to ozs.

The same lead cast into bars and sampled by sawing gave an average of 470 ozs.

Fifteen fractions taken at regular intervals during the same pouring ranged from 475 ozs.

In another case samples drawn at the beginning, middle, and end of a run gave 1345 ozs., 1335 ozs.

Chips taken from the same bar of auriferous lead may show in one place 23 ozs.