Geology and Mineral Deposits of Lincoln and Flathead Counties, Montana
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The User hereby assumes all responsibility for obtaining any rights to use the material in excess of “fair use.” The Survey makes no intellectual property claims to the products created by individual authors in the manuscript collections, except when the author deeded those rights to the Survey or when those authors were employed by the State of Arizona and created intellectual products as a function of their official duties. The Survey does maintain property rights to the physical and digital representations of the works. QUALITY STATEMENT The Arizona Geological Survey is not responsible for the accuracy of the records, information, or opinions that may be contained in the files. The Survey collects, catalogs, and archives data on mineral properties regardless of its views of the veracity or accuracy of those data. 148 GEOLOGY AND MINERAL DEPOSITS, LINCOLN AND FLATHEAD COUNTIES . NONMETALLIC DEPOSITS-BARITE 149 shovels. Waste is trucked to a dump at the south Some opalized rock was uncovered at the west of biotite and, if so, to determine the map) strikes N. 15° W. and dips 60° NE, crossing west end of the mine area. Milling is done by a end of a lower bench in 1964. nature of the alteration . the writer the Windjammer claim. The cross vein at the combination of wet and dry processes, including The Rainy Creek pluton has many minerals of favors the hypothesis that the vermicu- southwest ends of the Windjammer and Tungsten gravity methods, flotation, and screening. The potential value, besides the vermiculite, which is lite has been derived from biotite by the King claims (No. 3 on map) is 4Y2 feet wide, vermiculite concentrate is dried and screened to being marketed at present. Amphibole asbestos action of fluids of magmatic origin." strikes N. 60° W, and dips 47° SW. It is well ex various size ranges. (tremolite), the nearly pure feldspar in the syenite Another vermiculite deposit of undertermin- posed in a 35-foot drift, where its width averages The Rainy Creek intrusIve body is an elon dikes, biotite in the biotite mass, and apatite, as ed extent is north of Fleetwood Creek toward 30 inches. Some sulfides occur in this vein. The gate composite stock of biotite-magnetite-pyroxe sociated with vermiculite, pyroxene, and the mag the northern part of the Rainy Creek stock. (Fig. Tungsten King vein (No. 4 on map) trends N. 50° nite and syenite (Fig. 53) intruding strata of the netite-rich border phase of the biotite-magnetite 54). Eight unpatented claims, the Last Chance E. and dips 40° SE. It is a split off vein No.1 and Wallace Formation within the trough of a north pyroxenite intrusive body, may be profitable by and Last Chance No. 1 to 7, were staked by is 2 to 5 feet wide. Other veins crop out on the west-trending syncline. An alteration halo reported products if separation can be achieved economical George Ottoway and Mr. Fleetwood in 1925. The Buckskin and Windy Pass claims. The Buckskin to be 300 feet wide (Boettcher, 1963) consists of ly and if markets can be developed for these min property was acquired by H. J., H. L., and U. L. vein is 3Y2 feet wide, strikes N. 80° W., and 'dips recrystallized and sericitized metasedimentary erals. Poston of Kalispell in 1932. During the 1950's the 85° N. On the Rising Sun fraction, the vertical vein (No.1) is about 3 feet wide. All veins are in rocks surounding the magnetite pyroxenite; the Origin of the vermiculite is still debatable, property was leased and optioned by the F. &. S. intensity of alteration decreases outward from the Construction Company of Butte. Prior to 1964, the Wallace Formation, which trends about N. although some investigators have concluded that it 30° W. and dips 60° to 65° S. contact of magnetite pyroxenite with sedimentary is derived from biotite through hydrothermal al H. J. Poston assumed complete ownership of the rocks. A border phase of the magnetite pyroxenite teration or alteration by weathering and surface group. Tom Schessler (personal communication) re is magnetite rich, a grab sample of the material water. Boettcher (1963, p. 59) stated: A small irregular stock composed of por ported that a 3Y2-foot vein on the Buckskin claim assaying about 16 percent magnetite. phyritic syenite and some pyroxenite intrudes the contains 8 inches of quartz and barite on the "There is no evidence in the field or Boettcher (1963, p. 12) described two major Wallace Formation east of Bobtail Creek about hanging wall, 14 inches of yellow crystalline bar pyroxenite rock types; the more abundant type is in thin section to indicate that the ver ite in the center, and 20 inches of brecciated bar miculite (or biotite if the vermiculite was 10 miles north of Libby. The stock crops out on very coarse grained pyroxenite composed of py private land and National Forest land. At the ite, ankerite, and siderite on the footwall. Schess roxene (probably diopside) , mixed vermiculite and originally biotite) or the biotitite* core ler estimated the barite content of sections of are alteration products of the pyroxene. southwest end of the stock, an exposure in a hydrobiotite, and accessory fluorapatite; it con cut on the east side of the road exposes tremolite, veins as ranging from 40 to 60 percent. High-grade Furthermore, field relationships suggest tains all of the economic vermiculite in the stock. biotite, magnetite, and pyroxene minerals. Some parts of the veins may assay 85 to 95 percent that the venniculite (or biotite) and bio The grain size of the pyroxenite ranges from 1 cm vermiculite has been reported in the cut. Develop barium sulfate. titite are older than the veins, syenite to 2 meters or more in length, the average grain ment work consists of some pits in soil-covered dikes, and pegmatites, and could not be size being about 5 cm. The second, finer grained areas near the south end of the stock. type described by Boettcher forms zones within alteration products associated with their KENELTY BARITE the coarse-grained pyroxenite. It consists almost emplacement . It is concluded that entirely of pyroxene and contains only small quan biotite is a primary constituent of the BARITE The Kenelty barite lease is about 2 miles south of Loon Lake on the south side of a tribu tities of mixed venniculite and hydrobiotite, apa pyroxenite. The problem is to determine KOTSCHEVAR tite, garnet, magnetite, ilmenite, and sphene. if the vermiculite is an alteration product tary of the Fisher River, in Lincoln County. Ger The Kotschevar or Copper Mountain group is ald KeneIty of Libby discovered the vein during A mass of biotite, 600 by 1,000 feet, near *Biotitite is a term used by Gruner (1934) and Boettcher the center of the biotite-magnetite pyroxenite on Copper Mountain 5 miles south of Troy in the logging operations in 1960 and leased the property to describe a rock composed mainly of biotite, but con from The Anaconda Company in 1961. The proper intrusive body was described by Boettcher (1963, taining feldspar, pyrite, and calcite. Troy district. The property consists of nine un ty has been inactive for several years. p. 13) as consisting of 90 percent biotite and the patented lode claims and three millsites (Fig. 55). other 10 percent feldspar, pyrite, and calcite. The The group was purchased in 1958 from James B. Three trenches and a strip pit 175 by 18 by Robinson of Spokane, Washington, by Donald and contact between biotite and pyroxenite is sharp. 5Y2 feet expose a barite vein along a probable Lendal Kotschevar of Sandpoint, Idaho, and Mis Syenitic pegmatite bodies as much as 10 feet wide strike length of about 600 feet. Width of the vein soula, Montana. No production has been reported. ranges from 10 to 18 feet. The vein strikes N. 65° intrude both biotite pyroxenite and biotite. 10 II The property is developed by an 80-foot adit to 75° W. and is vertical or nearly vertical at the Bordering the biotite-magnetite pyroxenite in Co ntact of py rox enite . trusive body on the southwest (Fig. 53) is a /' - -.... I stock ond sed iments (accessible) on Vein No.1, a 35-foot adit on Vein center cut. The massive white and reddish-white syenite body, from which an apophysis extends No.3, and several pits and cuts on the other barite contains minor white quartz, hematite, and I In N-......... / T. veins. sericite. South of the stripped area (Fig. 56) is a into the pyroxenite. The main syenite body is 3t coarse-grained microcline microperthite containing Three branching fracture-filling veins and fourth cut exposing a 2Y2- to 3-foot vein, which 20 to 30 percent muscovite.