Diamonds – Oena
Historical Mining Activities
The Property has seen various forms of exploration and mining activities that started in 1992 with work by independent mining companies who mined the proto‐terraces at the Oena Section until 1995, producing some 30,000 carats with an average stone size of 2 carats. The largest stone recovered was 79 carats.
Between 1995 and 2000 various contractors were employed to test mine the Property. Small pits, trenches and bulk sample pits were excavated and treated through a conventional pan plant. The results of this test mining are not known.
Between 2000 and January 2006 systematic drilling was focused on the meso‐terraces and a bulk-sampling program.
Between February 2006 and August 2007 trial mining was performed with results documented in daily mining and plant treatment reports. These results were used to measure average diamond sizes and expected grades in basal and suspended gravels over the Oena meso‐terraces. These verifiable results have been used to estimate average grades for the gravel remaining at Oena. The systematic drilling results have been used in sections and volumes of gravel, both suspended and basal have been estimated using a polygonal block method.