The 5 Mile tufa occurrences are located on the southern side of the Kicking Horse River, approximately 6 kilometres east of Golden. A number of smaller tufa showings occur on the Eight, Nine, Eleven and Thirteen claims up slope from the 5 & 6 Mile occurrences. In 2003–-2004, the claims were explored by Golden Rock Products Inc.

The area is underlain by a northwest-trending belt of dolomite of the Middle Ordovician to Silurian Beaverfoot Formation. Locally, the dolomite is thrust faulted against limestone of the Upper Cambrian to Middle Ordovician McKay Group to the west and flanked by quartzite of the Middle to Upper Ordovician Mount Wilson Formation to the east.

The 5 Mile occurrence originates from a water source over 250 metres south of the Trans-Canada Highway and has been laid down in mostly bedded layers at least 4 metres deep at a point 150 metres south of the highway and to a maximum of 12 metres deep just 30 metres south of the highway. The youngest tufa is softer and porous while with time and compaction the under-lying tufa becomes denser and harder. There are relatively few pseudo-fossil casts of organic debris in the 5 Mile tufa deposit and the denser layers appear to be uniform and consistent in texture and hardness.

The deposit was divided into blocks based on texture and surface slope angle. The steeper slopes to the south (Block C) were deemed impractical to mine. The front face (Block B) is the easiest access and most practical tufa to mine. The area of the present day spring water (Block A) is mostly softer tufa and is to be avoided initially because of water problems (Assessment Report 27223).

1.) Block A covers 1750 square metres with average depth useable tufa estimated at 6 metres yielding a total of 10,500 cubic metres.

2.) Block B is of the form of a tapered wedge, covering 7800 square metres with average useable thickness of 7.25 metres yielding a total of 56,500 cubic metres.

3.) Block C is also of the form of a tapered wedge, covering 7500 square metres with estimated average useable thickness of 4.5 metres yielding 33,750 cubic metres.

In 2017, 92 Resources Corp. completed a rock sampling program on the property. A total of 60 metallurgical and 53 frac sand samples were taken from three locations on the property containing the occurrence. Highlighted results included zones of 99 to 99.5 percent silica content (Lindinger, L. (2018-03-28): Technical Report of Exploration Activities on the Zim Frac-Wil Property).