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Gold/Mining/Energy : International Precious Metals (IPMCF)
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To: Bill Jackson who wrote (26777)11/16/1997 5:19:00 PM
From: E. Charters  Read Replies (1) of 35569
 
Where that is got is 5.14 grams per short ton is indeed 0.165
ounces per short ton but the converter forgot that the "tonne"
we measure gold grams from is larger by 10.22%.

So penny weights per ton as in Bolivia and Guyana and early Canada
were measured in penny weights of 1/20 of an ounce troy (the weight
of an English penny) of a long ton which was 2240 lbs. This
ton was used for measuring iron. A ton unit was 224 lbs avoir. I believe.
So if a deposit was 4.80 pennyweights how many grams per short ton
was it? we had a spectrometer adjusted to ppm and a table in grams per
short ton and the assayer made reports like that comparing assays to
pennyweights. We thought we were short .03 ounces but not so.

This problem actually came up in Snow Lake about 15 years ago. That and
the engineering grid was in degrees magnetic originally and later was
surveyed and drilled according to true. So we had to figure the original
declination and relate to the later survey which allowed for a different
declination and figure the offset that the orebody was purported to have
from the change in declination over 50 years time. (They hadn't allowed
for it and after one mile it looked like we had a fault.) A paucity of
information is noted in these kind of meteorological records. It shows you
which way declination goes, but not over 50 years as it reverses within
that time.

Another one is the dollars per ton used in records from 1916 to present.
which dollar was it and which ton and how many of each per? You still
see lots of those files right up to 1960. No telling.

Oh and the name of the Phillipino assayer on that project who kept phoning
his wife every night who cried to him on the phone. Michael DeGuzman.
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