GULF MINERALS CANADA LIMITED A summary of this company's activities was originally prepared by Parsons (1961, p.46). While the company has reviewed its program at Nemegosenda Lake subse quent to the initial work, no major development has been undertaken on the property. A summary of the work completed from 1954 to 1959 is taken from Parsons (1961, p.46) and is as follows: "Late in 1954 this company completed the aeromagnetic survey that located the complex. Staking was begun in February 1955, and by the fall of that year, 196 claims had been staked; these claims were covered by detailed geological and magnetic surveys. By the fall of 1956 some 35,306 feet of diamond-drilling had been completed in 68 holes. Early in 1958 an adit was driven 580 feet to obtain a bulk sample for metallurgical extraction tests. These tests reached the pilot-plant stage in 1959." The higher grade niobium zones were described by Parsons as follows: "[Zone D] straddles the common boundary of Chewett and Collins townships, immediately east of the lake. It was found by cross-sectional drilling carried out to test the contact between the syenite intrusives and the alkaline fenites. No part of the zone is exposed. A total of 19,485 feet of drilling in 35 holes [Figure 3, Chart A, back pocket] has been done on and in the general area of the zone. A 580-foot adit penetrated 235 feet into the zone at approximately lake level. This work has indicated 20,000,000 tons of 0.47 percent Nb205 material in a block 600 by 800 feet in size and to depths up to 600 feet [Figure 6]. Diamond drill cross-sections and sketches of ore - wall rock relationships were presented by Parsons (1961). These are reproduced as Figures 6 and 7. A sketch of the geology of the adit in Zone D is given in Figure 8. The petrography of the host rock containing the niobium mineralization has been described under "Malignite and Aegirine-Augite Syenite" (unit 6). Faulting of the mineralized zone has been described under "Structural Geology". Parsons (1961, p.49) described the origin of the Zone D mineralization as follows: "Zone D is evidently a contact phenomenon between the intrusive syenite and the red alkaline fenite. The alteration of the red alkaline fenite in this contact zone to a feldspar rock has involved, among other things, the extraction of the pyroxene and pyrochlore-forming ions; these ions accumulated in the rock called malignite. As the intrusive syenite encroached on and absorbed the feldspar rock, the pyroxene-rich and relatively pyrochlore-rich malignite phase moved outward along, and occupied, zones of weakness and openings. The zones of weakness were probably caused by the syenite intrusion understoping the fenites, or by a subsi dence in the complex as a whole. The latter is common to late stages in the formation of alkaline complexes." Parsons described the "East" area of niobium mineralization as follows: "This ore area embraces a magnetic anomaly, about 4,000 feet long and 1,200 feet wide, in the south half of concession VI and the north half of concession V, lots 8 and 9, Chewett township. Interest in the area was originally stimulated by the presence of numerous radioactive boulders and soils. It has been partially tested by 7,690 feet of diamond-drilling in 19 holes [Figure 3]. This is insufficient to outline definitely the higher-grade niobium zones but, taken with the magnetic data, does indicate the possibilities of the area. "A brief description of the zones follows. It is not possible to give the true widths of the zones due to lack of data on their dips. "Zone A. - This is a distinct linear magnetic zone 3,000 feet long. It has been tested in three holes along a 3,000-foot length. These holes gave an average of 0.45 percent Nb205 over 116 feet of core. The zone is a pyroxenitic fenite type (locally quite fragmental) interbanded with red fenite with or without replacement 34 P.P. SAGE Fenite; fractured, brecciated and replaced or cut by malignite Figure 6. Vertical sections of mineralized zone D of Gulf Minerals Canada Limited. Reproduced from Parsons (1961). 35 CARBONATITE - ALKALIC ROCK COMPLEXES: NEMEGOSENDA LAKE Figure 7. Sketches of malignite breccia structures, exposed in wall of adit in Gulf Minerals Canada Limited's zone D. Stippled areas are red fenite; white areas are feldspathic alteration zones; shaded areas are malignite. Upper sketch shows occurrence of coarse acicular aegirine-augite. Reproduced from Par sons (1961). 36 (ob O .Co: ro O QJ .O c; OlTO Qi W) 4 00 UJ Oj iI U4 l g ^3 Ci Q) CARBONATITE - ALKALIC ROCK COMPLEXES: NEMEGOSENDA LAKE by fine magnetite and green garnets. There are narrow sections rich in apatite. Pyrochlore is locally visible as well as the rare-earth mineral, monazite. "Zone B. - This is a distinct linear magnetic anomaly 400 feet west of Zone A. It has been cut by six holes along its 1,700-foot length; these gave an average of 0.43 percent Nb2O5 over 101 feet of core. The mineralization is similar to Zone A except that the central high-grade shoot is normally a jacupirangite. "Zone E. - This zone lies immediately west of Zone B and has only a weak magnetic expression. It has been cut by four holes, which gave 0.43 percent Nb206 over 43 feet of core. It is a typical orthoclase-biotite pegmatite zone, having an indicated westward dip of 60 degrees. "Zone F. - This zone lies west of Zone E and is of similar mineralogical type. It has been cut by three holes along a 1,500 foot length. The grade averaged 0.37 percent Nb2O5 over 169 feet of core. "Zone G. - This zone lies west of Zone F and appears to branch off it. It has been cut in three holes along a 400-foot length and has a magnetic expression 800 feet long. The mineralization is variable, but the chief niobium-bearing rocks are magnetite-bearing pyroxenite, and brecciated pyroxenite in a matrix of biotite and apatite."
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