474 OFFICIAL JOURNEYS. 
Tuesday, August 19.—Timmins (485 m., 1029 ft.), in the Porcupine 
gold area, was reached in the morning, and a visit was paid to the Hollinger 
Gold Mines. A short walk from the train across what was once an arm 
of Porcupine Lake brought the party to their first objective, the power 
station. In Porcupine Lake, as in other waters in the vicinity of mines, 
the natural processes of silting are being hastened by the injection of 
waste sediments (sludge) from the mines. Large clayey or sandy tracts 
result, and at Timmins it is proposed to use these as building sites or for 
recreation grounds. At the power station the party, guided by the 
engineer in charge, inspected the fine installation (duplicate throughout) 
of modern power-generating plant. From the power station the party 
proceeded to the mills and workshops. Dividing here into small sections, 
each under a competent guide, they were shown on the one hand the 
complicated processes of extraction from the rough-crushed ore, and on 
the other the very complete repair and accessory outfitting plant which 
makes this mine, in its somewhat remote location, practically self- 
supporting in this direction. From the mill the members proceeded to a 
shaft, which some of them descended to the 1100-foot level. Here they 
were shown the main galleries—excellently cut, dry, and furnished with 
electric lighting and an electric traction system. The nature of the 
ore lodes was explained to them and an insight was gained into the actual 
methods of drilling, blasting, ‘ mucking’ (shifting of rough-broken ore), 
ore-crushing and ore-transport. 
The main excursion was joined at Timmins by a geological party of thirty members 
who had left Toronto on August 14. They travelled as guests of the Ontario Govern- 
ment, in charge of Dr. W. G. Miller, of the Ontario Department of Mines. At 
Timagami, the first halt, on August 15, he demonstrated several points of interest 
in close proximity to that station. The Cobalt series, of Pre-Cambrian age, exposed 
here, ranged from coarse conglomerates to fine-grained greywacké, but the meta- 
morphism was not of an intense character. A few hundred yards north of the 
station a conglomerate bed of the Cobalt series rests unconformably on the Keewatin 
rocks, and has been considered a tillite, but the evidence that these conglomerates 
are of glacial origin was not conclusive in the sections examined. Crossing the 
railway track, the Keewatin rocks were next examined, and among them members 
of the iron (jaspilite) series showed up on pavements smoothed by the Pleistocene 
glaciation. Rejoining the train, the party proceeded to Cobalt, and on arrival was 
transported by car to the Keeley Mine, South Lorrain. Dr. Mackintosh Bell had 
organised this visit so that the more important features might be seen in the minimum 
oftime. The great variety of minerals in this mine, in addition to silver, was indicated 
by the number of cobalt and nickel arsenides, sulph-arsenides and their oxidation 
products, which could be collected on the ore-dumps. The veins of native silver 
were, of course, the most spectacular features. Such veins were seen on more than — 
one level in the mine. On a neighbouring property—the Mining Corporation of 
Canada (Frontier Mine)—a fine series of specimens was laid out for inspection. The 
mineralisation is connected with the intrusion of the Nipissing diabase and the greater 
part of the ore comes from the Keewatin-diabase contact zone. The party was 
entertained to dinner by the Keeley Mine Company and the Mining Corporation, 
The return to Cobalt was made after dark, so that examination of the Cobalt area 
was held over until August 16. Mr. C. W. Knight, of the Nipissing Mines Ltd., 
conducted the party on Saturday and demonstrated in the first instance the Cobalt 
series resting on the Keewatin pillow-lavas. The oldest bed of the series was a well- 
marked breccia 2-3 ft. thick and overlain by conglomerates. The latter were easily 
examined on the glaciated surfaces exposed in the search for veins during exploration 
work on the area, and the size and variety of boulder was a distinctive feature of the 
beds, Finer-grained beds (greywacké) also were present, but, even in these, boulders 
were of common occurrence. The Nipissing diabase intrusion was in contact with 
the greywacké at this place, and, as one would expect, it was very fine-grained nea 
