The Beirnes-Anthracite coal occurrence comprises the coal showings exposed along the lower valley of the Skeena River between Beirnes Creek and Langlois Creek, approximately 149 kilometres north-northeast of the community of Stewart.

The Beirnes-Anthracite occurrence forms part of the southern Groundhog coalfield. The coalfield is an oblong (30 by 80 kilometres) area extending southeast from the headwaters of the Klappan and Little Klappan rivers to Groundhog Mountain. Refer to the Discovery deposit (104A 078), located 11 kilometres south, for an overview on the exploration history, regional geology and local geology of the southern Groundhog coalfield.

Multiple coal seams are located in the lower Beirnes Creek, Anthracite Creek and Langlois Creek. Best documented are the six seams along the lower 850 metres of Beirnes Creek which were explored by short adits in 1911. Thicknesses at surface range from 1 to 4.8 metres. The seams strike 300 degrees and dip 30 degrees to the northeast. The 178-metre drillhole 70-1 located near the mouth of Beirnes Creek intersected ten seams for an aggregate 9.6 metres of coal (Coal Assessment Report 098). Six seams totalling 6.7 metres were intersected between 45 and 111 metres depth. The most prominent seams are the Scott and Ross; coal quality testing gave the following results:

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                                         Scott        Upper Ross     Lower Ross
                                         Seam       Seam              Seam
                Thickness            1.74          2.29            0.76
                Fixed carbon      78.1          83.4            82.5
                Ash content        15.2          11.0            11.1
                Volatile matter      6.6            5.7              6.4
                Sulphur content    0.5            0.5             0.8
                Calorific value    6746         7163          7283
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Thickness is in metres, calorific value is in calories per gram, other values are in per cent. The above values are based on washed samples using a 1.75 grams per cubic centimetre specific gravity float separation. Fixed carbon to volatile matter ratios indicate anthracite rank coal.

Drillholes 81-5 and 81-6 were located adjacent to Anthracite Creek approximately 4.5 kilometres southeast of drillhole 70-1 (Coal Assessment Report 114). Hole 81-5 intersected three seams in excess of 0.5 metre, the thickest being 1.8 metres. Hole 81-6 encountered ten seams over 0.3 metre thick with none exceeding 1 metre, however, multiple seams separated by thin shale partings were intersected at two depths. Coal quality test results were not reported.

In 2012, parts of the Biernes-Anthracite prospects were held by Anglo Pacific as part of their "Discovery Property", others are held by Atrum Coal as part of their "Groundhog Project".