The A-4 occurrence, located on the A-4 drill hole, is approximately 1.5 kilometres northeast of Asitka Peak and 15 kilometres west of Johanson Lake (Assessment Report 5202).
Regionally, the occurrence lies within the Stikine Terrane, which is an aggregate of allochthonous Paleozoic and Mesozoic magmatic arc assemblages and overlying sedimentary sequences (Monger, J., 1984). Volcano-sedimentary arc successions, of the Permian Asitka Group and the Upper Triassic Takla Group, are considered `basement' in this area. Volcanic and sedimentary sequences of the Lower to Middle Jurassic Hazelton Group overlie the Takla Group. Coarse clastic rocks of the Middle to Upper Jurassic Bowser Lake Group unconformably overlie the arc assemblages. In turn, the Bowser Lake Group is unconformably overlain by a continental clastic sequence, the Upper Cretaceous to Eocene Sustut Group. Structurally, the area lies west of the north-northwest trending Ingenika-Findlay fault which separates the Stikine and Quesnel terranes. To the east, the area is bounded by the north-northwest trending Moose Valley fault. Further west of the Moose Valley fault, the area is cut by numerous crosscutting thrust and normal faults, which strike northwest and northeast. The stratified rocks have undergone regional greenschist metamorphism and are cut by ultramafic to intermediate intrusions of Late Triassic to Cretaceous age.
Locally, the area is underlain by the Upper Triassic Savage Mountain Formation (Takla Group). The formation consists of greenish to red-brown intermediate porphyritic flows, chloritic tuffs and agglomerates, and minor intercalated epiclastic sediments. The stratified rocks are intruded by the Early Jurassic Asitka Peak stock, which ranges from hornblende and/or biotite granodiorite to quartz diorite. These rocks are cut by feldspar porphyritic basic dykes, generally less than 3-metres thick (Assessment Report 5202).
Widespread copper mineralization is present on the Asitka Peak property; the geology and nature of the surface mineralization is typical of the peripheral area of a porphyry copper system. Geochemistry outlines most areas of surface or near surface copper mineralization. Molybdenum values correlate well with copper and emphasize the northeastern intrusive contact; however, they seem to be confined within the intrusive body. Both copper and molybdenum values in soils are most widespread along that portion of the northeast intrusive contact located on the main ridge north of Asitka Peak, and outline a northwesterly-trending zone which is largely obscured by overburden.
Propylitic alteration is not very pronounced, but is more pervasive towards the northwest margin of the pluton. The alteration minerals present are chlorite, epidote, and pyrite. Minor calcite, siderite and specular hematite were also noted. Within this alteration zone, there are areas of extensive pyrite mineralization. Possible argillic and potassic alteration may be present near the northeastern contact and at the deeply eroded parts of the intrusive (Assessment Report 5202).
Chalcopyrite with minor bornite and associated pyrite and copper carbonates, occurs in fractures and epidote or quartz stringers within the intrusive. Malachite staining is present along the fractures and traces of magnetite and molybdenum occur on some fracture surfaces (Assessment Report 5437). The entire A-4 drill hole averages 0.035 per cent copper and a 3-metre intersection assayed 0.011 per cent molybdenum (Assessment Report 5437).
Hole A-4 was collared in an area where several mineralized outcrops are located. These mineralized outcrops were exposed during the construction of the access road and gave no initial geochemical response. The core is mostly greenish gray, slightly to moderately chloritized granodiorite. Epidote is more dominant (possibly 5 per cent) than in any of the other drill holes. Minor pinkish potash feldspar alteration is present over narrow widths. Minor pyrite is usually present as disseminated grains partly replacing ferromagnesian minerals or in stringers and veinlets. Chalcopyrite occurs primarily associated with pyrite-epidote rich stringers; minor magnetite is sometimes present. Traces of molybdenite are seen on some fracture surfaces in the lowermost 46 metres of the drill hole.
Drilling indicates the following general characteristics: The epidote-pyrite-chlorite alteration assemblage is typical of the propylitic zone of alteration in a porphyry copper. Scattered low grade copper values as chalcopyrite occur in a zone where pyrite can vary from trace to 25 per cent of the rock volume, also typical of a porphyry system. Trace amounts of magnetite, specularite, and molybdenite are present. There are spotty occurrences of K-feldspar alteration. Epidote content increases as the northeast contact is approached. Overall copper content increases as the northeast intrusive contact is approached.
WORK HISTORY.
West Point Mines Limited staked the Sil and Jim groups (30 claims) in 1965. The company name was changed in 1966 t o Black Giant Mines Ltd. Additional staking was done during 1966 to a total of 185 claims. No work was reported and the claims subsequently lapsed 1968 and 1969. In 1969, the Chalco claims were staked by W. Sevrens, covering part of the property later owned by Nomad Mines. Nomad Mines Ltd. acquired the Asitka 1-24 claims from principals of the company by an agreement of March 1972. The claims surrounded Asitka Peak on three sides, the west, north, and east. Additional staking was done in the Asitka and Bob groups to a total of about 60 claims and fractions. Cash in lieu of assessment work was paid in 1972 and the first exploration by Nomad was carried out during the 1973 field season. WHEN a preliminary exploration program consisting of geological mapping, prospecting, line cutting, geochemical soil sampling (479 samples) and a magnetometer survey was carried out. This program resulted in the location of widespread copper mineralization. In 1974, Nomad collected a total of 407 soil samples and analysed for copper and molybdenum (Assessment Report 5202). The copper geochemistry roughly outlines a northwesterly-trending zone of discontinuously mineralized quartz veins. On the Bob group, only a few higher copper values are outlined. There is a general correlation between high molybdenum values in soils and the main northwest trending body of anomalous copper values. Four diamond drill holes totaling 676 metres were completed in 1974; holes ranged from 160 to 185 metres in depth.
In 1981, prospecting was conducted in the area northeast of Asitka Peak by John Mirko (Assessment Report 9546). In 1981, a portion of the property was restaked as the Asitka Peak claims and minor prospecting and sampling was completed. In 1989, area northeast of Asitka Peak was restaked as the Asitka 1,3 and 4 by K.V. Campbell. Minor geochemical soil and rock chip sampling and prospecting was conducted (Assessment Report 20006).
The SIT claim group, staked in 1990 for International Corona Corporation, includes the Sit 1 (242823), Sit 2 (242828), Sit 5 (242831), Sit 6 (242832) and Sit 7 (242833) claims. Geological mapping and prospecting were performed in 1991, visiting and documenting previously discovered mineral showing and making new discoveries as well (Assessment Report 22018). Work included 25 man-days in the field, when 100 rock and 24 moss mat samples were collected. A large area between Asitka Lake, on the south, and Johanson Lake on the north, was prospected by Corona.
In 1994, a block of 8 claims totaling 84 units covering the core area was staked by Lucero Resource Corp. Subsequently, an additional 15 claims totaling 300 units was staked by Lucero in 1995. In April, 1995, a combined, airborne, HEM/magnetometer survey was completed over most of the property on behalf of Lucero Resource Corp. A total of 1062 kilometres were flown over the Gold A property (Assessment Report 24014). The data outlined a number of magnetic highs in areas of known calc-silicate alteration and/or areas which are predominantly overburden-covered, and which are peripheral to known areas of intrusive rock. In August, 1995, four of these areas were gridded by soil samples to see what kind of correlation existed between magnetics and mineralization. A total of 986 soil samples were collected mostly from the “B” horizon (Assessment Report 24227).
In 2018, Serengeti Resources completed a one day “first pass” exploration on the Arjay property in order to determine if further work was warranted. The property yielded 3 high grade copper samples along a small 0.1- to 1-metre-wide quartz shear zone that appears to be continuous along 250 metres (Assessment Report 38158). These samples were taken just east of Asitika Lake showing (094D 146) and are likely part of that showing.
In July of 2018, John Bot a contracted R. Beck Consulting Services to conduct a short sampling program along the gossanous hillside of the western flanks of Asitka Mountain (Assessment Report 37708). Eleven of 12 samples collected during the program were taken along a northwest trending traverse west of Asitka 25 (094D 097) and Asitka 29 (094D 094). A more significant sample was taken between Asitka 10 (094D 148) and Asitka 19 (094D 096).
In 2019, Peter E. Walcott & Associates Limited undertook an induced polarization survey over parts of the Arjay/Goldway property for Serengeti Resources Inc (Assessment Report 39133). In total, some 7.8-line kilometres of induced polarization surveying was completed on two traverses. The program was completed in order to test for the presence of chargeability and resistivity features below and adjacent to anomalous geochemical copper, gold, and silver values and airborne magnetic anomalies. Results of both IP surveys at Arjay-Goldway were reported to have displayed strong chargeability and resistivity results. One east-west line line was put in about 3 kilometres south of Asitka Lake. The other line had its southern point about 800 metres west-northwest of the Asitka Lake mineral occurrence (094D 146) in a significant creek valley, extending north-northeast within the valley (and beyond) for a total of about 3.5 kilometres.
