The Anti 1-4 claims are located on the east side of Mill Creek, approximately two kilometres north of the junction of the Kitwanga River and Skeena River. The antimony showing was originally discovered in the 1920s during logging operations. At this time, a number of short, roughly 3 metre long adits were dug into a narrow and steeply dipping vein of stibnite that is exposed over 20 metres.

The area is underlain by Middle Jurassic to Upper Cretaceous Bowser Lake Group sediments. Locally the rock is brecciated with a siliceous matrix containing stibnite.

In 1966, L.J. Manning and Associates staked the area and collected approximately 75 soil samples over the property. A B.C. Department of Mines assay from the period assayed 17.66 per cent stibnite (Property File - Schroeter, 1978 (Field Notes Anti-Kitwanga)). Other assays from this time range from trace to 12.9 per cent stibnite with trace silver (Property File - Schroeter, 1975 (Assay Samples-Anti Claims)).