412 Canadian Record of Science. 
subsequent in age, along which fault plane the correspond- 
ing portions of the strata above and below it were horizon- 
tally separated by 210 feet, and of course, the ore bodies 
similarly situated. 
It will be easily understood that in m ining in this district 
the miner constantly meets with many puzzling complica- 
tions, and a level may berun, all unknown, within a foot or 
more of ore, but the more extended use of the electric 
diamond core drill is proving a great ally in easily and 
cheaply prospecting its formation for300 or 400 feet in any 
direction. 
The ores of Leadville, as already said, are very favorable 
for smelting, but at Aspen, most of the ore is “dry” or 
with less than 5% of lead, and what was for a long time 
very detrimental, with more or less of ‘‘heavy spor” or 
barite which made the ores refractory. The presence of 
‘copper stain” of the blue or green of copper carbonates in 
the ore is considered as generally a sure index that it is 
valuable enough to mine, and sometimes in the mines when 
a fresh face of ore had been just disclosed on blasting, the 
ore looked very beautiful with the white glittering spor 
richly colored with these stains and interspersed with the 
shining faces of galena crystals in a setting of dull black of 
silver minerals. 
PROCEEDINGS OF THE NatTuraL History Society. 
Annual Meeting. 
Monrtreat, May 29th, 1893. 
The annual meeting of the Society was held this evening, 
the Very Rev. Dean Carmichael, President, in the chair. 
The minutes of the last annual meeting and of the regu 
lar meeting of April 24th were read and approved. 
Minutes of Council meeting of 17th April were read. 
Hon. Justice Wurtele read the report presented by him 
on behalf of the Society at the annual meeting of the Royal 
Society at Ottawa. 
