In the Extension prospect area southwest of Tatsamenie Lake, pre-Upper Triassic tuffs, phyllites, siltstones and limestones are underlain by Permian limestones of the Stikine Terrane. These rocks are intruded by plutonic rocks associated with four separate igneous events. These consist of foliated diorite of Triassic age, unfoliated albitite and monzonites of Jurassic and Late Cretaceous ages, respectively, and feldspar porphyry dikes of the Sloko Group of Eocene age. The volcanics and sediments have undergone two phases of folding, a tight isoclinal fold with a horizontal fold axis and an upright more open fold. The early isoclinal phase of folding is associated with thrust faulting, which places Upper Carboniferous felsic phyllites on Permian limestone. The Jurassic intrusive rocks include a sodium metasomatized variety of diorite composed of albite feldspar. The albite sill is locally mineralized with pyrite, boulangerite and tourmaline. The Permian limestones consists of a massive, white, thick bedded, grey weathering, recrystallized limestone unit overlain by a dark grey, thin bedded, grey weathering carbonaceous limestone unit. The upper unit contains boudins of chert and/or pyrite. The limestones are pervasively silicified with local areas of brecciation. The breccia contains large fragments of limestone, banded limestone and phyllite in a dark matrix. Quartz veins commonly occur in the phyllites and dolomitized limestone. Disseminated pyrite is common in these rocks.
As a result of MMI soil sampling from 2007 onward over the Extension Grid, five distinct soil anomalies were found to occur over and surrounding the area of the Extension showing:
Anomaly A has very strong results in gold, silver, arsenic, lead, zinc, cadmium, and 12 rare earth elements. It strikes north and northwest for a strike length of 1,300 metres and a width of 100 to 400 metres. The rock samples taken within this anomaly are mineralized with galena, chalcopyrite, pyrite, antimony, zinc, silver, and gold. Typically, the mineralized samples are associated with white quartz veins or grey chalcedony. Host rocks are foliated phyllite. Values from the 16 samples yielded highs of 0.73 gram per tonne gold, greater than 100 grams per tonne silver and greater than 1 per cent copper, lead, and zinc (Assessment Report 36941).
Anomaly B is a strong cobalt/nickel/copper anomaly correlating with anomalous molybdenum and minor silver. It strikes similarly to anomaly A, that is north and northwest, with a minimum strike length of 1200 metres being open to both the south and north-northwest. It has a width of 160 metres to a minimum of 400 metres being open to the west.
Anomaly C is a weaker gold anomaly with correlating results in molybdenum and silver. It strikes northwest and has an average width of 150 metres and a minimum strike length of 1,600 metres being open to the southeast.
Anomaly D is a copper anomaly correlating with strong results in cobalt, some molybdenum and minor zinc. It strikes northeast for a minimum 600 metres being open to the northeast and has an average width of 150 metres.
Anomaly E is also a very strong gold silver, arsenic, zinc, and cadmium anomaly that is similar to anomaly A. It also correlates with strong anomalous results in molybdenum, lead, and rare earth elements. Anomaly E strikes northwest as well for a minimum 1,000 metres being open to the northwest and is 180 to 300 metres wide.
Four of the MMI anomalies, A to D, inclusive, show strong correlations with IP anomalous results which indicate the causative sources to be sulphides, probably base metal, containing values in gold and silver. The IP inversion sections also show the depths to the various causative sources to vary from near surface to 115 metres. The magnetic survey results show the magnetic field over the Extension grid to be low along the western part and increase in intensity towards the east-northeast side. This indicates an intrusive may occur below the east-northeastern part of the grid, possibly at depth.
Prospecting in 1994 by North American Metals, less than a kilometre to the south of the LCZ zone (104K 080), located a silicified limestone outcrop with overlying phyllites containing silicified shears and limestone lenses. This area is referred to as the LCZ Extension zone. Mineralization in the limestones consists of sparse, fine-grained, euhedral pyrite with a trace of very fine dark grey sulphides. The phyllites host narrow, silicified, pyritic shear zones with minor quartz veining. Several of the limestone lenses were found to be silicified and carrying strongly disseminated pyrite, lesser chalcopyrite and tetrahedrite, and malachite. Rock samples of LCZ Extension silicified limestone failed to yield any significant gold, the highest value being 75 parts per billion, however, very limited outcrop exists in this area. Of seventeen samples collected from silicified shears in the phyllites three yielded strongly anomalous results (Assessment Report 23552):
1) 2000 parts per billion gold over 1.8 metres (Sample #1154),
2) 1130 parts per billion gold weighted average over 3.0 metres (samples 1144 and 1145).
The 2006 Tatsamenie property work program consisted of a Landsat 7 image study that displays significant areas of iron oxide and/or hydroxyl (clay) alteration. The property is about 6 kilometres north of the past producing Golden Bear Mine and covers twelve mineral showings documented in MINFILE. These showings are the Nie (104K 081), Nie 3 (104K 092), Misty (104K 091), Tut (104K 097), LCZ (104K 080), Honk (104K 122), Tatsamenie Lake (104K 038), Barron (104K 120), Patella (104K 134), Backbone (104K 135), Shoulder (104K 136), and LCZ Extension (MINFILE 104K 137).
In 2007, on behalf of Nakina Resource Inc, Geotronics Consulting conducted a Mobile Metal Ion (MMI) soil geochemical survey, collecting 420 MMI soil samples. The distance between the southern limit of the LCZ mineralized trend (104K 097) and the relatively new LCZ Extension (104K 137) is a further one kilometre to the south. This represents a distance of approximately 2 kilometres of potential gold bearing mineralized ground. The 2007 grid was laid out in that largely unexplored area between the LCZ trend and the LCZ Extension zone. The grid area was mapped previously phyllite. The 2007 Mobile Metal Ion soil sampling survey in the LCZ Extension area defined a broad zone of highly anomalous gold and associated anomalous elements that extended to the grids north, south and eastern limits.
In 2008, on behalf of Nakina Resource Inc, Geotronics Consulting conducted a Mobile Metal Ion soil geochemical survey, collecting 663 MMI soil samples in the LCZ Extension area. Work also consisted of an induced polarization survey on the same grid, and a magnetic survey totalling 11.5 kilometres. MMI anomalies A and B are reported with IP survey correlation. The work was mainly confined in LCZ extension area.
In 2010, on behalf of Nakina Resource Inc, Geotronics Consulting expanded a Mobile Metal Ion soil geochemical survey in the LCZ Extension area, collecting 663 MMI soil samples. Work also consisted of a 9.9 line-kilometre induced polarization survey and an 18.4 line-kilometre ground magnetic survey. The anomalies have been grouped into five anomalies, or anomalous zones, labeled by the upper-case letters, A to E, respectively. Three of these have been defined by gold anomalous results, and include anomalies A, C, and E; the other two have been delineated by copper anomalous results and include anomalies B and D. Four of the MMI anomalies A to D, inclusive, show strong correlations with IP anomalous results which indicates the causative sources to be sulphides, probably base metal. In general, the MMI results indicate that mineralization occurs over a wide area and the mineralization is zoned. The work was done mostly in the area around and immediately north of the LCZ Extension showing, extending towards the LCZ trend area that is discussed in MINFILE 104K 080. The grid falls just short of the LCZ trend zone.
In 2012, Nakina Resources Ltd. Collected 257 soils samples on Extension showing (104K 137) and the Ophir North Grid, just north of the Nie 3 showing (104K 092) MINFILE plot.
In 2015, DeCoors Mining Corp. collected 209 MMI soil samples on the Extension Grid which revealed numerous anomalous elements over the Extension showing area. Results were plotted for silver, arsenic, gold, cadmium, cerium, cobalt, copper potassium, molybdenum, nickel, lead, and zinc on 14 plan maps and then contoured.
In 2016, work on the Extension was carried out by a DeCoors Mining crew of 2 men. Work consisted of an XRF rock survey of 26 rock samples.
In 2017, exploration work by DeCoors consisted of picking up 56 MMI soil samples along two lines and collection of 16 rock samples from outcrop at 9 locations. The soil results for 13 elements, namely silver, gold, cadmium, cerium, cobalt, copper, molybdenum, nickel, lead, antimony, uranium, and zinc, were plotted and contoured onto plan maps. A 14th map of the potassium/thorium ratio was also plotted and contoured. The outcrop rock samples were obtained within MMI anomaly A, some as a result of pit digging.
In 2018 DeCoors sent a 3-personcrew to collect MMI soil samples and 20 rock samples. Ten rock samples were collected on the Extension (104K 137) and 10 on Backbone (104K 135).
In 2018 or 2019, DeCoors Mining Corp. completed a 21-kilometre airborne VTEM and Magnetic Survey over the southern part of the Extension Grid as well as to its west within the Tatsamenie Property. A 65-kilometre survey was planned but was cut short due to poor weather. The airborne VTEM survey revealed 3 conductors that have been labelled by the Roman numerals I to III. Conductors I and II occur within the southern part of the Extension Grid and each one correlates with a resistivity low, an IP high, and MMI soil anomalies. The suggested interpretation is that the VTEM conductors are reflecting a strong alteration zone associated with sulphide mineralization. VTEM conductor III occurs to the west of the Extension Grid and therefore there is no correlation with any groundwork. However, it does correlate with and a magnetic low as mapped by the airborne magnetic survey.
In 2020, Brixton Metals Corporation completed a program of geochemical (rock and soil) sampling, a 12.5 line-kilometre ground induced polarization survey, a 715 line-kilometre airborne magnetic and electromagnetic survey and 19 diamond drill holes, totalling 5292 metres, on the area of as part of the Thorn property. Drilling was performed on the Outlaw (MINFILE 104K 176) occurrence area.
Refer to LCZ (104K 080) for details of the Tatsamenie property and previous work history.