The Tu showing is situated immediately southwest of a small lake at the headwaters of Martin Creek, approximately 35 kilometres northeast of Clearwater.
The area is underlain by the Shuswap Metamorphic Complex, with granitic intrusives likely representing an extension of the Raft Batholith to the southwest.
A northerly trending muscovite granite unit separates a biotite gneiss unit to the west and a quartz mica schist unit to the east. A skarn is developed along the contact between the granite and schist.
Tungsten mineralization occurs as scheelite crystals up to 0.5 centimetre long, in a diopside-vesuvianite-garnet-tremolite skarn. Minor sphalerite occurs occasionally. The mineralized zone strikes 115 degrees and dips steeply north for about 30 metres with a width varying between 2 to 4 metres.
In 1983, prospector Andy Horne discovered scheelite float in a newly exposed road cut, prompting the staking of the Tu claims. That year, Sulpetro Minerals optioned the property and conducted a limited soil sampling–percussion drilling program. No significant results were obtained and Sulpetro dropped the option later that year. The following year, Horne staked three additional claims after trenching encountered scheelite-bearing skarn. Noranda Mining and Exploration Company Limited optioned the property in late 1984. Between 1984 and 1985, Noranda Mining and Exploration conducted a program of soil sampling, trenching and diamond drilling on the property. A total of 500 samples were collected from an 11.4-kilometre soil grid. Eight diamond drillholes totalling 303.7 metres were completed on the Tu-100 claim. In spring 1985, the original claims were abandoned and relocated and the property was expanded by additional staking. By 1986, Noranda had dropped the option on the claims and returned them to Horne.
In 1999, prospectors Gordon Richards and David Bennett discovered the Readymix gold showing situated to the east of the Tu occurrence. Samples of stream sediment, till and oxidized intrusive breccia boulders returned anomalous values for gold, as well as silver, bismuth, tungsten, arsenic, stibnite and lead. In September 2000, the Readymix claims were staked over an area that included the former Tu claim area. Between 1999 and 2010, Bennett and Richards conducted minor exploration programs consisting of soil, bulk till, rock and mobile metal ion geochemical surveying and very low-frequency electromagnetic geophysical surveying.
In May 2010, Newmac Resources Incorporated optioned the Readymix claims and incorporated them into the Raft property. Between 2010 and 2012, Newmac conducted exploration programs consisting of trenching, soil geochemical surveying, diamond drilling, and induced polarization, magnetometer and very low-frequency electromagnetic geophysical surveying. Localized high-grade mineralization was encountered, but there was an overall lack of apparent continuity, both laterally and to depth. As of early 2014, the property was still held by Newmac Resources.
A 2-metre trench sample assayed 2.04 per cent tungsten. The best diamond drill intersection was 0.49 per cent tungsten over 2.45 metres (Assessment Report 14380).
