Exploration
Far City Mining hired the Geophysical Exploration Team of Sichuan Bureau of Geology and Mineral Prospecting and Development (SBGMPD) to conduct the general exploration program of the Jiaogenma mining area. The work included prospecting, geology, ground geophysics, soil and rock sampling, geochemistry, rock analysis, diamond drilling and trenching.
The following table shows the work done for years 2009 and 2010:
WORK AT JIAOGENMA IN 2009 & 2010 | ||||||||
Far City Mining Limited – Jiaogenma Sn-Zn Project | ||||||||
Work Item | Work | |||||||
Unit | QTY | |||||||
A. Terrain Mapping | ||||||||
1. Control surveying (GPS) | Point | 12 | ||||||
2. Engineering survey | Point | 398 | ||||||
3. 1:2,000 topographic survey | km² | 4.05 | ||||||
1:10,000 topographic survey | km² | 5.9 | ||||||
5. 1:1,000 topographic survey of line profiles | Km | 47.16 | ||||||
B. Geological Survey | ||||||||
1. 1:2,000 geological survey | km² | 2.3 | ||||||
2. 1:10,000 geological survey | km² | 5.9 | ||||||
3. 1:1,000 geological survey of line profiles | Km | 19.5 | ||||||
4. 1:10,000 hydro-geological survey | km² | 10 | ||||||
5. 1:10,000 geological survey | km² | 10 | ||||||
6. 1:10,000 environmental geological survey | km² | 10 | ||||||
7. Long-term monitoring of hydrogeological points | Point | 3 | ||||||
C. Geophysical and Geochemical Prospecting | ||||||||
1. 1:10,000 magnetic survey(80 m x 20 m) | km² | 3.5 | ||||||
2. IP intermediate gradient coverage (80 m x 20m) | km² | 2.25 | ||||||
3. Layout of survey grid (80 m x 20 m) | km² | 3.5 | ||||||
4. IP sounding | Point | 41 | ||||||
5. 1:10,000 soil survey(80 m x 20m) | km² | 1.83 | ||||||
6. Layout of soil survey grid(80 m x 20m) | km² | 1.83 | ||||||
D. Diamond Drilling (6 DDH, 401 core samples assayed) | 6 Core holes | 1,579.15 | ||||||
E Re-mapping old Adits (401 Samples) | m | 2284.7 | ||||||
F. Trenches (50 Trenches) | m³ | 3,194.06 | ||||||
G. Rock Analysis | ||||||||
1. Rock analysis Zn, Sn, Ag, Pb | Piece | 1,050 | ||||||
2. Geochemical soil analysis Cu, Pb, Zn, Ag, Sn, As, Sb, Hg | Samples | 1,544 | ||||||
3. Thin section | Piece | 70 | ||||||
4. Polished section | Piece | 2 | ||||||
5. Samples for density 45 samples for each of three main zones of mineralization | Section | 4 |
GEOLOGY
The geological surveys at 1:1,000 scale, on lines 400 m apart over Zone 1, Zone 2 and Zone 3 provided geological information about the strata, structure and metamorphic rocks. In addition, the entire property was mapped at 1:10,000 scale and Zone 2 at 1:2,000 scale in 2009.
MAGNETIC AND IP COVERAGE
The magnetic and induced polarization (IP) surveys are at Zone I and part of Zone 2. These surveys trace the northern and southern extensions of the mineralized zones defined in Zone 2. There are five magnetic anomalies, M1 to M5, in the north area and 11 magnetic anomalies, M1 to M11, defined in the south area. In 2010, additional magnetic surveys were completed in the southern area. The magnetic anomalies seem to show the extension of the fracture zones under the Quaternary sediments where there are no geochemical anomalies.
GEOCHEMICAL COVERAGE
In 2009, the 1:10,000 scale soil survey covering 1.83 km² was completed over Zone 3. In this survey, 1,400 samples were collected and a large number of polymetallic anomalies were found. Tin anomalies were found in the north and south west parts of the area. The anomalies cover large areas have a high peak value and are associated with zinc and silver anomalies. The geology in these anomalous areas is similar to that hosting the tin mineralization in Zone 2.
TRENCHING
In 2009, a total of 35 (1,398.95 m³) exploratory trenches were constructed and cleared and 15 (1,803.11 m³) exploratory trenches were dug in 2010. In 2009, 248 channel samples were taken from the trenches and assayed for tin, zinc and silver. In 2010, 144 channel samples, from the trenches, were assayed for tin, zinc and lead.
Trenches were dug at right angles to the fracture zones. The mineralization exposure by the trenches is good. For the hand trenches, the trench width is based on a depth of 1.5 m. The trench will penetrate about 0.2 m into the bedrock. The start and finish point locations are measured with a GPS. The channel sample is taken when the lithology changes or mineralization is observed. The channel sample is usually 10 cm x 3 cm and about 2.00 m long.
ADITS
In 2009, 18 prospecting tunnels numbered LD1 to LD16, LD19 and LD20, that had been left uncompleted by previous contractors, were cleared up, mapped and sampled. This totalled 2,284.7 m of tunnel. Sampling consisted of 401 samples and highest values of tin, silver and zinc samples are 5.64%, 36.3 g/t and 5.96% respectively.
DRILLING
Drilling was subcontracted by SBGMPD to the Chengdu Geological Engineering Investigation Institute who performed the drilling, core logging, core sampling and technical management. Six drill holes were drilled in 2009. The total length of drill holes is about 1,579.15 m and a total of 373 drill core samples were collected for assay.