A Brief Geological Resume of the Little Long Lac Gold Area
Prepared for “Gold” by Percy C.[sic] Hopkins, Consulting Geologist1
Part 1 of 4
GEOLOGY; a large area of rocks favourable for gold prospecting extends from Lake Nipigon to Long Lac, a distance of 75 miles. The Canadian National Railway passes through the gold belt which is upwards of 25 miles wide in places. Gold is being produced at the Beardmore mine and a 200 ton mill is being constructed on the Little Long Lac Mine and diamond drills are finding ore intersections on several properties. Shaft sinking is under way on the McLeod Cockshutt and Dik Dik. Many new gold discoveries have been made in the area already during 1934.
The geology has been mapped in a general way and reported on by T. L. Tanton and the late Dr. A. G. Burrows, both of whom reported favourably on the possibilities of finding gold deposits in the area. G. Langford mapped the eastern part of the field in more detail. Dr. E. L. Bruce is mapping the area in detail at present.
The rocks consists largely of Keewatin lavas, tuffs, iron formation and rusty carbonate with much intermingled fragmental rock, some of which are Timiskaming in age. They have been closely folded into synclines and anticlines whose axes strike nearly east and west with the beds dipping from 75 degrees to vertical.
A few porphyry dikes are present while Algoman granite masses occur in places. Lamprophyre, diabase, diorite and gabbro intrusives are common in some properties.
The gold deposits are of various types. The Little Long Lac vein consists of parallel quartz veinlets in a shear zone in greywacke schist and tuff. Gold is frequently visible in the quartz and associated with small quantities of pyrite, arsenopyrite and stibnite.
Quartz veinlets carrying similar minerals in diorite and diorite tuff occur on the Long Lac Lagoon near the Mosher boundary. Gold also occurs in a quartz stringer in porphyry on the Lagoon.
On the Dwyer and Dalton and in one of the McLeod-Cockshutt veins the gold values occur in part in quartz veins cutting iron formation. Much zincblende and galena are present in the Dik Dik vein which occurs near the contact of granite and Keewatin.
The Bankfield veins contain mispickel, chalcopyrite, pyrrhotite, pyrite and gold and occurs in silicified greywacke intruded by porphyry.
The veins on the Hard Rock are partly in arkose.
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Mr. Hopkins who furnished the above information was instrumental in interesting capital originally in Beardmore, Little Long Lac, Bankfield and other properties in the area and is financially interested in some of these properties. He has been one of the most active factors in bringing the various favorable areas to the attention of mining interests. He regards Tom Johnston as the key prospector of the district, the latter having made the discoveries on Bankfield, Little Long Lac (with Tony Okland[sic]) Long Lac Lagoon and Dik Dik.
(Continued in Part 2)
1 Percy Eugene Hopkins was born in Southern Ontario in 1887 and obtained a degree in mining engineering from the University of Toronto. From 1914 to 1924, he worked for the Geological Survey of the Ontario Bureau of Mines. In this capacity he explored, described, and mapped many areas in Ontario’s North. In 1923, the United States Geological Survey published a volume with included a bibliography of his numerous contributions up to 1918 (Geologic Literature on North America, 1785 – 1918, Bulletin 746, by John M. Nickles, United States Geological Survey, p. 525.) He wrote 10 articles and co-wrote 7 articles in that time period. Up to 1934 (the date of publication of this Gold edition), he met and knew many players in the Greenstone/Kowkash gold areas, including Tom Johnson. Percy E. Hopkins numbers among the many unsung great mining personages who have yet to be recognized in the Canadian Mining Hall of Fame. Hopkins retired in 1954 and spent his days, according to his obituary, “golfing, curling and watching the stock market”. He passed away in 1976.
03a Building the first headframe for the Little Long Lac mine ca 1933. Private collection of Ross Houghton/Ron Duhaime.
03b Title of Gold magazine.
03c “Pit in high grade ore on Little Long Lac Gold mine . . . “
03d “Mrs. Percy Hopkins and daughter . . . “
03e “The original discovery on the Little Long Lac Gold mine . . . “
03f Percy Eugene Hopkins, U of T graduate in 1910. Ancestry.ca.
03g Bibliography from Bulletin 746.
03h Ad in Gold magazine.