Deli Jovan Exploration Permit
Highlights
- High-grade quartz-vein-hosted gold mineralization - 209 g/t Au maximum value from channel sample (underground)
- High-grade quartz-vein-hosted gold mineralization - 209 g/t Au maximum value from channel sample (underground)
- Previous mining limited to shallow depths by water table - depth extensions untested
- Underground workings cleaned, mapped and sampled by Reservoir - high grades and structural continuity confirmed
- Excellent potential for establishing low-cost underground gold mine
Mining and Exploration History:
There is evidence of mining in the Roman times. The Weifert family initiated exploitation of the gold-bearing quartz veins from several locations within the Permit in the 20th century, prior to World War II. The principal areas of historical production within the Permit were Rusman and Ginduša, where exploitation of the auriferous quartz veins was by open pit and underground mining (3 levels -- the depth was limited by the water table), Selište, Perina Čuka as well as from the placer deposits in the drainage from the area. The grades are reported to have been 10 -- 150 g/t gold from quartz veins up to 2.5 m wide. There are no reliable production figures from the period of exploitation -- earlier estimates suggest 20 tonne gold (approximately 625,000 ounces gold) was produced from the district.
Geology and Mineralization:
The geology consists of altered pyroxene gabbros (probably early Palaeozoic age) that are intruded by dykes of Permian granite porphyry dykes. Quartz veining with gold and minor copper mineralization occurs in several discrete zones along a NW-SE trend along a strike length of 8 km. The vein systems are steeply dipping, vary in thickness from 0.30 to 2 meters, and can extend for 100 meters along strike. The vein systems consist of bifurcating and anastamosing quartz veins, and are invariably associated with strong shearing in the host gabbros. Underground mapping at Ginduša demonstrates that the quartz veining is controlled by two shear orientations -- 315º to 330º and 260º to 280º, with the latter being associated with the highest gold grades and cross-cutting the regional NW-SE trend. Shoots of high-grade gold-in-quartz mineralization occur in dilation zones on the controlling planar structure, and it is expected that these structure will plunge to depths beyond that already mined (approximately 90 m below surface).
Talc-carbonate alteration of the gabbro is common, Fe-carbonates are locally developed in the altered gabbro, and sericitisation is restricted to the immediate contact with the quartz.
The vein quartz is generally milky and cryptocrystalline, and contains disseminated fine-grained pyrite. Coarse pyrite and chalcopyrite heal fractures in brecciated vein quartz. Telluride, stibnite and arsenoyprite are also reported in the literature. Calcite occurs in some of the quartz veins, as well as a late stage of calcite veins.
- In the Balkan region, the geology and mineralization is comparable to gold-bearing Palaeozoic inliers in eastern Serbia (Stara Planina, REO Exploration Permit) and western Bulgaria (Ogosta deposit -- historical resource of 1.33 million ounces gold).
- Quartz-vein hosted gold mineralization in altered (talc-carbonate) gabbro host rock associated with multiphase deformation along a regional shear structure is comparable to the Mother Lode and other gold deposits in the Sierra Nevada, California, and other orogenic lode gold deposits.
Title and Area:
The Deli Jovan Exploration Permit was granted to SEE d.o.o. on 12 May 2007. The Permit currently covers an area of approximately 69 sq. km.
Exploration Status:
Surface work completed:
- Detailed geological and structural mapping of prospect areas
- Identification and sampling of all dumps and old workings, including "pinge" (ancient exploration pits) - mean value of 7.32 g/t Au from 34 samples collected at surface over the Ginduša area, maximum value of 47.50 g/t Au
- Ground magnetometry
- Orientation soil sampling
Underground work completed:
- The Company has re-opened 1038 meters of old underground workings on the +550 meter level at Ginduša and undertaken systematic sampling (55 samples) of the gold-bearing quartz vein mineralization in three areas of previous underground stoping: H-10/560, H-5/6, and H-4
| g/t gold |
Sample length meters (across vein) |
| 48.5 |
1.0 |
| 209 |
0.6 |
| 48.9 |
0.5 |
| 33.4 |
0.5 |
| 30.5 |
0.5 |
Best samples at Ginduša
| Stope |
Vein
strike
length |
Number
of sample
sites |
Sample
lengths |
Average
Au (g/t) |
| H-6 |
38 m |
8 |
0.3 -- 1.0 m |
9.71 |
| H-4 |
30 m |
5 |
0.4 -- 0.5 m |
10.57 |
including |
10m |
3 |
0.4 -- 0.5 m |
17.15 |
| H-10 |
17 m |
5 |
0.5 -- 1.0 m |
18.82 |
The average gold content in individual veins systems at Ginduša that can be mapped and sampled along a strike length greater than 10 meters
- 103 meters accessed on +560 meter level at Rusman, work terminated due to collapse on the quartz vein system, from which 3 grab samples of mineralized quartz vein yielded 98.8 g/t, 84.6 g/t and 30.6 g/t gold.
