Geology of the Ohra-Takamine Property comprises a sequence of predominately Pleistocene aged volcanics underlain by Pliocene sediments and volcanic rocks (Kagoshima Block, 1997).

The Hokusatsu andesite is the primary host rock to known gold deposits, reported to be Middle Pleistocene in age (1.8 Ma ⁴Watanabe, 2005). The formation comprises andesitic to dacitic intrusives and volcanics of the same composition.

Small areas younger post-mineralisation Ito Formation volcanics cover the other units in the southeast of the project.

The seven Au mine deposits found within and in proximity to the Ohra-Takamine property are classified as rift low-sulphidation epithermal. Details of the mineralization at the deposits are described below.

The Takamine-Urushi mine was developed over three northeast (N45° E) striking gold-bearing quartz veins, with lengths up to 350m. The No. 2 vein was reported to carry gold grades between 50 to 100 g/t. Quartz-calcite-adularia veins were notable for massive zones consisting of black bands and transparent quartz. Native gold, pyrite, chalcopyrite and sphalerite are recorded. Fluid inclusions temperatures of 213 to 227 degrees have been reported (⁶METI, 2000).

Takamine mine vein strikes northeast, has a length of 450 meters, average width of 1 metre and was exploited over a vertical height of 120m (METI, 1989). Veins are composed of quartz with lesser amounts of calcite, carrying native-gold, pyrite, galena and manganese-bearing minerals. Fluid inclusion temperatures of 233 to 252 degrees are recorded (⁶METI, 2000).

The Ohra northeast striking vein is reported as 1,200m long with an average width of 0.9 meter (¹Michitoshi, 1967). Three veins are recorded striking N60°E dipping 60°N. Average widths of the quartz-calcite veins are 0.9m. Veins are divided into many small parallel veinlets carrying native gold, argentite, chalcopyrite, pyrite and galena. A fluid inclusion temperature of 221 degrees is recorded (⁶METI, 2000).

• Historical mine localities and geology of the Ohra-Takamine property
  
• Ohra-Takamine mine workings, drillhole locations, soil anomalies and hydrothermal alteration zones