Tyson-Nortoba prospect, Dorthea Township, Thunder Bay District, Ontario, Canada

History:

1930-34: Springer-Sturgeon Gold Mines Ltd. held the West or Sellars Group. Brennan and Kenty Bros. Prospecting Co. Ltd. held the East or Brennan-Kenty Group. Mid-Canada Exploration Co. Ltd. optioned the Brennan-Kenty claims, which were later optioned by Kenbro Strugeon Gold Mines Ltd.
1935: Amorada Gold Mines Ltd. held 20 unsurveyed claims. Trenching and sampling were undertaken on gold and gold-molybdenite bearing quartz veins. 1936: Consolidated Mining and Smelting Co. of Canada Ltd. sampled the No. 3 or Molybdenite Vein. A total of 530 m of diamond drilling was done, tracing the No. 3 Vein to a depth of 115 m. An mo bearing quartz vein 23 m south of the No. 3 Vein was also drilled.
1958-59: Nortoba Mines Ltd. performed geophysical surveys, trenching, stripping and diamond drilling. A gold-sulphide zone 15-21 m wide was located and traced for 120 m along strike. A 75-100 t/d mill was purchased and plans for a decline proposed.
1960: Nortoba Mines disposed of their assets due to a funds shortage. 1962: Mead Mining Corp. Ltd. drilled 7 holes totalling 920 m.
1963-64: A.E. Tyson and W.T. Woods acquired the property and bulk sampled the No. 1 and 1A Veins.
1965: Candore Explorations Ltd. initiated a program of geological mapping, trenching, stripping and diamond drilling (17 holes, 1200 m) to investigate the Mo deposit.
1983: Stroud Res. Ltd. optioned the property and conducted a stripping, trenching, sampling and mapping program.
1986: Claims held by A.E. Tyson and Mrs. V.W. Tyson.

Geology:

The general geology consists of an east-trending sequence of metavolcanic rocks. The claim group is underlain by massive, pillowed, amygdaloidal and porphyritic mafic flow rocks and intermediate to felsic tuffs, tuff-breccia and flows. A fine to medium-grained quartz diorite lens intrudes the volcanic rocks. A major east-trending lineament occurs just north of the Tyson Mines property. Metavolcanics are strongly to weakly foliated 75 degrees to 95 degrees. Five main fissure-type quartz (+/- carbonate) veins occur and intrude all rock types on the property. The No.1, 1A, 2 and 7 Veins are auriferous; the No. 3 Vein is gold and molybdenum bearing. No.1 Vein: has been traced for 1200 feet, ranges in width from 7 to 31 inches and strikes N80 degrees W. Dip is vertical to steeply south. The vein appears to follow a fault along which a somewhat rusty shear zone has developed. The country rock is coarse-to-fine-grained andesite. No. 1A Vein: has been exposed for 60 feet with an average width of 15 inches, and parallels the No. 1. No. 2 Vein: Has been traced about 1600 feet, is 475 feet south of the No. 1 and parallel to it. In low ground toward the west end it consists of a rusty shear zone up to 40 inches in width and carrying numerous quartz stringers. Farther east the shear zone persists, but the quartz becomes more or less concentrated into a single vein with a maximum width of 13 inches. No. 7 Vein: located 250 feet south of the No. 2 and just south of the winter road. It consists of an irregular network of quartz stringers in a strongly carbonatized shear zone, which strikes east and has a maximum width of 12 feet. The immediate country rock is altered andesite, but a parallel dyke of quartz diorite occurs a few feet to the north. No. 3 Vein: constitutes the main molybdenite occurrence. The maximum concentration of vein material appears to be about 3 feet, but in places the vein splits into a number of parallel veins.

Mineral List

6 entries listed. 5 valid minerals.

References