Found this at Yukon Geological Survey on Dublin Gulch
Sounds like the first 4 holes were drilled in 1986, sounds like there was some more drilling later that year
Next drilling was 16 holes by Amax in 1991.
First holes only found narrow intersects.
The 1986 drilling tested 4 of 14 veins outlined by Queenstake Resources. Best results were obtained from the Catto Vein: one hole returned 44.6 g/t gold over 0.4 m; while a second, 91 m to the west, assayed 60.3 g/t gold, also over 0.4 m. A hole on the No. 23 Vein intersected 74.7 g/t gold over 0.5 m.
In 1988, additional drilling on the Catto Vein returned up to 11.2 g/t gold across a true thickness of 2.7 m, while work elsewhere on the property located a few veins on the floor of Dublin Gulch.
Four mineralized zones were identified: the Eagle, Olive, Shamrock and Steiner Zones. Further diamond and reverse circulation drilling in 1992 was focused on the Eagle zone which was determined to host the greatest amount of potential mineable ore.
The Eagle Zone is located approximately 3 km southeast of the original occurrence location, near the western end of the Dublin Gulch Stock. In the Eagle Zone, sheeted quartz veins occur predominantly in the intrusion and only locally extend into the metasedimentary rocks. Veins are commonly 0.5 to 1.0 cm wide and are orientated with a strike of 065 to 080 degrees and dip of 60 to 85 degrees to the southeast. Alteration and mineralization are directly linked to the intrusion and thus changed character over time as the magma cooled. Gold occurs as native gold in the gangue or associated with bismuth minerals, with lesser amounts of gold contained in arsenopyrite. Although individual veins grade from 10 to 30 g/t gold, a typical 1.5 m sample interval which includes both the vein and granodiorite host rock ranges from 0.8 to 2.0 g/t gold in the ore zone. Silver values are generally lower than gold values.
Amax Gold dropped its option in late 1992. The following year First Dynasty Mines (a successor company of H-6000) drilled 12 reverse circulation drill holes and one diamond drill hole (2,909.6 m) within the main Eagle Zone to further define the ore zone's grade and extent. Seven of the 12 reverse circulation drill holes returned better than average ore grades and widths, while the remaining 5 were instrumental in defining the boundary of the deposit. The diamond drill hole returned anomalous assays from the top 145 m, grading 0.24 g/t gold with only three 1.5 m samples grading better than 1 g/t (1.02, 1.29 and 1.59 g/t gold). These results showed that mineralization continues along trend but becomes sub-economic to the northeast. Further reverse circulation and diamond drilling programs together with engineering, economic, environmental studies were carried out in between 1994 and the summer of 1996.
The history to around 2007
data.geology.gov.yk.ca |
