Review of Recent Geological Literature. 239 
the Keewatin, and is in the direct line of strike of the rocks from 
Tower. 
Copper and nickel are described at Bruce and Sudbury, and that at 
Sudbury is supposed to be in the northwestern extension of the rocks 
that contain the copper and nickel of the old Wallace mine near the 
shore of lake Huron, and similar nickeliferous copper has been observed 
at numerous points intervening. 
Eecent discoveries of gold are announced. The Huronian mine is in 
the township of Moss, and the gold is found free and as sylvanite (or 
telluride of gold) associated with galena, iron and copper pyrites and 
blende. This is in a quartz vein, and the country rock is a "talcoid 
chloritic, dioritic and a little dolomitic schist," with siliceous mag- 
netite and massive dioryte. This is the usual manner of occurrence 
at the other numerous places mentioned in the report. Yet in one 
instance, on lake "Wahnapitae, it was found in narrow quartz veins 
cutting a highly feldspathic reddish quartzyte resembling fine-grained 
granite, but distinctly elastic. In this respect this deposit resembles 
that of the famous Treadwell mine on Douglass island, Alaska, as 
described by Dr. Geo. M. Dawson and Mr. F. D. Adams in this jour- 
nal.* In general the gold of Ontario seems to be embraced in the 
same (Keew^atin) formation as the mines of Michigan near Ishpeming. 
In the same formation are described briefly some unimportant dis- 
coveries of silver and some of argentiferous galena; zinc, antimony, 
arsenic, tellurium, platinum, tin, molybdenum, bismuth and cobalt 
have also been found in Ontario in small quantities. 
In the Animikie formation are the great silver mines of Ontario 
northwest of lake Superior. Here silver occurs native, in grains, 
threads and small branching forms, and as argentite in leaves and 
small masses, but occasionally in large crystalline lumps, as at the 
Rabbit Mountain mine. Huntilite and animikite, two new silver 
compounds, were found some years ago at Silver Islet, near Thunder 
bay in the great Silver Islet mine. This mine has been worked to the 
depth of 1230 feet, the work continuing up to the beginning of 1884, 
the value of the silver extracted having been $3,250.00. The vein in 
the part w^orkedwas from 8 to 10 feet in thickness, but in some places 
measured 20 or 30 feet. The vein, w-hich is one of quartz carrying, 
along with free silver, galena, blende and graphite, runs N. 32° W. 
across Burnt island and on to the main shore, crossing a dike of 
diabase trap. The silver was found only in and near the trap. 
Graphite was present in the richest parts of the vein. Hydrocarbon 
gas and water holding chlorides of sodium, calcium and magnesium 
were struck in the deeper workings of the mine. Graphite and in- 
flammable gas have since been met with in other silver mines in the 
district. 
Small quantities of native copper have been found in the Nipigon 
formation on St. Ignace, Simpson's and Battle islands. But on the 
♦American Geologist, vol. iv., pp. 84, 88. 
