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Arctic Star releases Sequoia kimberlite geological logs

2021-06-28 14:18 ET - News Release

Mr. Patrick Power reports


Arctic Star Exploration Corp. has released more detailed geological logs for the Sequoia kimberlite. The core has been logged in Yellowknife by Dan Gainer, PGeo, a geologist who is knowledgeable in kimberlite geology.

The Sequoia kimberlite is thought to be a number of kimberlite intrusive and volcanic events that have coalesced into an approximately one-kilometre-long-and-200-metre-wide kimberlite complex. Arctic drilled two holes 232 metres apart into different sectors of a gravity low (less dense) and resistivity (more conductive) geophysical anomaly, interpreted as mapping the complex. The holes intersected contrasting kimberlite types confirming the complex consists of multiple volcanic events. Each volcanic event can have different diamond grades and in some cases different diamond qualities (average values).

An attached table summarizes the geology from the two Sequoia drill holes. Kimberlites are relatively small volume volcanoes and volcanic rock terms are applied to describing the different rock types. The term volcanoclastic means that this rock was formed relatively near surface and that the material was part of probably explosive eruption. They are fragmental rocks, and the matrix consists of either muds derived from the surface or ash derived from the eruption, or combinations of these. Often the fragments are dominated by the local country rock the kimberlite intruded into. Kimberlite clasts also occur along with crystals (xenocrysts) from the mantle and the kimberlite melt.

The term coherent kimberlite describes a fragmental rock where kimberlite fragments dominate; the matrix consists of kimberlite. This rock type is thought to be intrusive or extrusive.

Kimberlite core observations and geological interpretations can estimate the potential for each particular rock type to carry commercial (diameter of more than one millimetre) diamonds. Rock types that are fine grained, grains size of one-millimetre crystals and kimberlite fragments dominate have higher potential.

Other visual aspects of the core are the presence and abundance of indicator minerals. Diamonds are formed at depth of more than 150 kilometres and under great pressure, and subsequently brought to the surface via the eruptive kimberlite event. Along with diamonds and in two to three orders of greater abundance come other unique minerals (indicator minerals), as they are also formed under high pressure. Indicator minerals were noted in all the rock types observed in the two Sequoia drill holes. The coherent kimberlite and the lower volcanoclastic kimberlite are thought to have the best diamond potential due to the abundance of indicator minerals and the coarse grain size. There are other aspects that control the diamond content so it needs to be noted that a rock that is considered to have high potential will not necessarily contain economic amounts of diamonds.

The NQ-size kimberlite drill core was mechanically split and sent to the SRC laboratory in Saskatoon. Samples were sent in eight-kilogram charges (which represent approximately 4.3 metres of core separated by geology where possible). An attached table lists the samples sent for the Sequoia kimberlite. Once all the samples from each kimberlite are processed, the laboratory will release the results.

Qualified person

The qualified person for this news release is Buddy Doyle, AUSIMM, a geologist with over 35 years of experience in diamond exploration, discovery and evaluation. Mr. Doyle is a qualified person under the provisions of National Instrument 43-101.

About Arctic Star Exploration Corp.

Arctic Star has commenced exploration in Lac de Gras, NWT, on its Diagras diamond project next to the producing Diavik and Ekati diamond mines. The company also owns 100 per cent of the Timantti diamond project, including a 243-hectare exploration permit and a 193,700-hectare exploration reservation near the town of Kuusamo in Finland. The project is located approximately 550 kilometres southwest of the operating Grib diamond mine in Russia. The company also controls drill-ready diamond exploration properties in Nunavut (Stein).

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