Doradilla Tin

The Doradilla Project represents a large and strategic tin project with excellent potential for associated copper, silver, bismuth, indium and zinc mineralisation. The known mineralisation is recorded within a skarn horizon which has an extensive strike length of 16 km (the ‘DMK Line’).

The regional geology of the area is not entirely clear but it is apparent that the area contains a major crustal suture representing the break between the Lachlan and Thompson Orogens. Recent work by the NSW Geological Survey demonstrates that the mineralising intrusives for the area are Triassic aged (235 Ma) and have similar age and chemistry to the major tin granites in the New England region such as the Mole Granite.

Previous exploration has focussed heavily on the tin content of the DMK Line, which comprises zones of oxide, supergene and primary tin mineralisation. Only part of the DMK Line has been evaluated, and the potential exists for additional resources. In addition, aeromagnetic features indicate the potential for other skarn horizons, parallel to the DMK line, which remain untested.

Tin exploration at Doradilla ceased in 1990 due to depressed tin prices combined with unsatisfactory metallurgical recoveries in the primary tin-silicate zone. YTC’s strategic partner, Yunnan Tin Company Group, successfully mine and process similar tin-silicate style tin mineralisation in their deposits in China.

In addition to tin, the Doradilla Project also represents a strong exploration target for nickel, copper, silver, bismuth, zinc and indium. In particular, the supergene tin- laterite deposits currently identified at 3KEL & Midway have the potential to contain economic levels of copper and zinc mineralisation based on the few holes that have been assayed for these metals. A considerable amount of previous drilling was assayed for tin only, with no systematic exploration carried out for any other metal.

Aurelia Metals has secured the right to earn 70% of the Doradilla Project from Templar Resources, a wholly owned subsidiary of Goldminco Corporation Ltd (‘Goldminco’ TSXV: GCP) by spending $1.5m over 5 years.

Drilling by YTC Resources has confirmed the tin laterite mineralisation at the 3KEL deposit is also rich in indium, bismuth, copper and zinc. Significant results include:

Hole From (m) To (m) Interval (m) Sn % Cu % Zn % Bi ppm In ppm Comments
3KAC004 6 46 40 1.56 0.56 0.38   117 Mineralised to end of hole (46m)
includes 18 36 18 3.04 0.85 0.73 170 230  
3KAC007 2 18 16 0.77 0.54 0.36 464 46  
3KAC011 10 45 35 1.24 0.11 0.39 264 41 Mineralised to end of hole (45m)
3KAC014 16 52 36 0.91 0.29 0.58 522 34 Mineralised to end of hole (52m)
3KAC016 2 44 42 1.32   0.23 1822 40  
includes 4 14 10 4.44     973 107  
3KAC020 0 38 38 1.12     329 34  
includes 4 16 12 2.75     338 69  
These results are all recorded from the upper ‘tin-laterite’ oxide zone of the 3KEL Deposit. The consistent grades and shallow depths point to the potential for a large, shallow resource suitable for low-cost open cut mining. YTC’s drill programme combined with historical drilling, demonstrates continuity of strong, near surface mineralisation over a strike length of at least 2 kilometres within a laterally extensive mineralised zone of 16 kilometres, much of which is yet to be tested by drilling.YTC Resources have announced an Inferred Resource for the tin laterite (oxide) mineralisation at the 3KEL and Midway tin deposits.

Combined Resource:7.81Mt @ 0.28% Sn (at a cut-off grade of 0.1% Sn) for 22.3kt of contained tin

A summary of the Inferred Resources is presented below:

  Midway   3KEL  
Sn cut-off Mt % Sn Mt % Sn
0.1% 4.63 0.25 3.18 0.34
0.2% 1.97 0.40 1.85 0.48
0.5% 0.38 0.92 0.56 0.89
The estimation of an Inferred Resource at Midway and 3KEL is seen as the first step in the evaluation of all the tin deposits at the Doradilla Project. The 3KEL and Midway deposits lie at the north eastern end of the 16km tin mineralised skarn horizon, known as the DMK line. The other significant tin deposit on the DMK line is the Doradilla Deposit. A resource has yet to be estimated on either the oxide or primary tin mineralisation at the Doradilla Deposit. YTC is continuing the data collation, digitizing and validation of all historic drilling and is planning validation drill holes on the deposit.YTC Resources has commissioned detailed metallurgical studies on mineralised samples from the 3KEL deposit.

Nickel Sulphide Exploration

Areomagnetics has identified a number of ultramafic trends, where limited historic drilling identified broad intervals of nickel sulphide “skarn” mineralisation of the ‘Avebury’ type.

Significant results from previous explorers include:

Hole Intersection Company Year
DR1 64m @ 0.23% Ni North Broken Hill 1972
DBT-1 25m @ 0.13% Ni Shell Minerals 1981
NDW-P88 2m @ 1.13% Ni Seltrust Mining 1981

A programme of aircore holes were designed to drill through the deep (+70m) laterite weathering profiles and terminate on weathered ultramafic bedrock. The strongest bedrock results for nickel were followed up by diamond drilling to define the nickel sulphide mineralisation below the base of weathering. Significant aircore results include:

Hole From (m) To (m) Interval (m) Ni % Co ppm
MAC001 63 107 44 0.30 148
MAC003 60 117 57 0.40 370
MAC017 42 72 30 0.40 187
MAC018 42 86 44 0.45 165
WAC010 54 80 26 0.39 250

Follow up diamond drilling produced anomalous sulphide based intercepts such as:

Hole From (m) To (m) Interval (m) Ni % Co ppm Cu ppm Sn ppm
WD001 251 282 31 0.29 163 904 156
The presence of anomalous tin values demonstrates the the granite related skarn origin for this mineralisationLode and Bulk Tonnage Exploration

To the north of the DMK Line a series altered and mineralised quartz porphyry dykes outcrop in the vicinity of the Doradilla Copper Mine. YTC drilling has demonstrated broad low grade tin and zinc mineralisation as seen in hole DCMD001.

Hole From (m) To (m) Interval (m) Zn ppm Pb ppm Sn ppm Comments
DCMD001 133 159 26 3664 689 275 Mineralised to end of hole (159m)
Mapping and rock chip sampling shows that these altered dykes occur over a 4km2 area.The Doradilla Copper Mine exploited a high grade oxide copper + silver + (?)gold lode in the 1920’s. YTC drilling has intersected a previously unrecognised high grade silver – bismuth lode.
Hole From (m) To (m) Interval (m) Sn ppm Cu ppm Pb ppm Zn ppm Bi ppm Ag ppm
DCMD002 126.65 129 2.35 360 509 3790 842 7720 449

The lode runs parallel to a larger, mineralising quartz porphyry intrusion, and is open both at depth and south along strike.