Most of the upper Fraser River drainage, which follows the northwest trend of the underlying country rock, is covered by Quaternary alluvium and glacial deposits. Scattered outcrops are of Cambrian and/or Hadrynian (Proterozoic) Cariboo Group sedimentary rocks and/or their metamorphic equivalents.

The Alroy property is underlain by pale quartzite, probably part of the Cambrian(?) Yanks Peak Formation, which forms several prominent exposures at lower elevations in the upper Fraser River valley. Exposures of quartzite form several small to medium-size 'humpbacks' whose long axes follow a northwesterly trend.

The main exposure of quartzite is approximately 450 metres in length (oriented along an azimuth of 132 degrees) and is about 52 metres wide at its widest point. Thin to medium beds of quartzite are defined by either vague pale orange bands of Fe-oxide or, less commonly, micaceous partings. Bedding ranges from 112 to 126 degrees and dips moderately to steeply to the southwest (47 to 88 degrees). A prominent subvertical jointing, oriented at 030 degrees, cuts the quartzite. Veins of milky white to semi-translucent 'bull quartz' intrude the quartzite mainly along joints and bedding planes.

In 1996, three hand samples were collected from the property by British Columbia Geological Survey geologist Dan Hora and submitted for whole rock analysis. The results are listed below: sample 96-01 was quartzite with micaceous partings; sample 96-02 was the clean, centre part of a quartzite bed; sample 96-03 was the clean, centre part of a quartzite bed with secondary quartz veining.

---------------------------------------------------------------------
Sample SiO2    Al2O3   MgO     Na2O    MnO     Fe2O3   TiO2
        %       %       %       %       %       %       %
96-01  97.39   0.98    0.01    0.01    0.01    0.06    0.14
96-02  98.41   0.65    0.01    0.01    0.01    0.05    0.1
96-03  98.7    0.45    0.01    0.01    0.01    0.13    0.01
Sample P2O5    CaO     K2O     Cr2O3   Ba      LOI     Total 
         %       %       %       %      ppm      %       % 
96-01  0.01    0.08    0.23    0.01    500     0.31    99.29 
96-02  0.01    0.08    0.16    0.01    291     0.27    99.81 
96-03  0.01    0.08    0.12    0.01    218     0.3     99.95 
---------------------------------------------------------------------

(Assessment Report 31139)

In the late 1990's through 2006, four small pits were blasted to provide fresh rock for geochemical analysis; along with tree clearing, stripping, trenching, geochemical characterization of the silica and related work. In 2007, surface reclamation of the former pits was completed along with a program of two diamond drill holes, totalling 113.6 metres.