The Touro target was an active garimpo (artisanal mine) in the 1980s and is located 17 kilometres southwest of Aurizona. The miners processed gold from quartz veins and vein stockworks hosted by altered tonalites and diorites that were mined from open pits and underground workings along the north-south trending Touro Shear Zone (TSZ). A large tailings deposit, the product of artisanal mining, extends for 1 kilometer north-south at Touro. Outcrop is limited to the walls and floors of garimpo pits. Luna conducted several exploration programs including geological mapping, rock and channel sampling, geophysical surveys, a scout reverse circulation program, and a tailings auger drill program
Gold mineralization at Touro is hosted in sheared and altered tonalite and diorite of Paleoproterozoic age, with tonalite being the dominant host. Tonalite alteration consists of silicification, sericitization, carbonatization, sulfidation, albitization along with introduced tourmaline. Bleaching is widespread. Pyrite is the dominant sulfide in mineralized material but gold is also associated with quartz veins and stockworks. The exploration results are positive and set the stage for future drill programs at this target.
Luna completed a large soil survey combined with geological mapping in the area surrounding the Touro target. Numerous new saprolite and alluvial artisanal pits have been mapped and a large gold-in-soil anomaly some 3 kilometers in diameter has been defined extending outwards from Touro. Two new target areas, Canis and Draco, have also been defined adjacent to the Touro target. This soil anomaly is coincident with a large sub-circular feature defined by elevated copper, cobalt, gallium and molybdenum values which suggest that Touro may be part of a larger intrusive related mineralizing system. Geophysical magnetic features are also coincident with these geochemical anomalies. Luna is working to determine the significance of this data and is excited by the potential scale and structural setting that the exploration programs are defining.
Figure 1. Geological Map Touro Central and North West (NW)
57.00 meters @ 0.81 g/t Au including 26.00 meters @ 1.26 g/t Au and 1.00 meter @ 7.12 g/t Au in TOURD001 (Section 0000)
24.00 meters @ 1.24 g/t Au including 2.00 meters @ 7.51 g/t Au in TOURD002 (Section 0100S)
85.00 meters @ 0.72 g/t Au including 8.00 meters @ 1.27 g/t Au and 5.00 meters @ 1.11 g/t Au in TOURD003 (Section 0200S)
15.00 meters @ 1.18 g/t Au in TOURD010
9.00 meters @ 3.85 g/t Au including 2.00 meters @ 15.58 g/t Au in TOURD014
1.25 meters @ 56.53 g/t Au in TOURD012
Figure 2. Touro Central and North-West Targets Geophysical Map
Surface Channel Sampling Program
Following reconnaissance geological mapping, a channel sampling program was conducted across all available outcrops at Touro. Some 461 meters of sampling (523 individual samples including QA/QC) was completed. Detailed mapping was conducted along the channels, and these data have been integrated into a preliminary geologic model. The program identified several zones of both low and high grade outcropping gold mineralization. Diamond drilling intersected the down-dip extensions of this surface mineralization. Select mineralized channel intervals are tabulated in the adjacent PDF named Touro Rock Sampling.
Reverse Circulation Drill Program
There is lack of outcrop at Touro due to the occurrence of extensive tailings deposits. Accordingly, a reverse circulation (RC) drill program was conducted to test for mineralized saprolite to a maximum depth of 30 meters beneath these deposits. This program successfully delineated a sub-cropping mineralized zone beneath the tailings to the north and south of the garimpo pits. This information assisted in the siting of diamond holes and the mapping of the TSZ. Select mineralized RC drill intercepts are tabulated in the adjacent table named RC Drill Program.
Rock sampling was also conducted to determine the grades of individual quartz vein sets. Some 95 samples were collected during geologic mapping. Gold values range from below detection limit to 26.20 grams per tonne and 35% of samples (34 samples) assayed greater than 0.50 grams per tonne.
Diamond Drill Program
The Touro target is located 17 kilometers southwest of the Aurizona Gold Mine. Seven positive drill holes totaling 1,674 meters were announced on January 28, 2013. On June 19, 2013 Luna announced the results of an additional 11 diamond holes totaling 1,984 meters which were drilled during the first quarter 2013. In total, Luna has drilled 18 holes for 3,658 meters at Touro.
The initial seven hole diamond drill program depicted subsequently in Figure 3, totaling 1,674 meters, was designed to intersect mineralization in transition and fresh rock along the north-south trending TSZ, as well as to provide information to build a preliminary geologic model. All holes were drilled on surveyed 100 meter spaced sections towards 100 degree azimuth to intersect the shear zone at right angles. All holes intersected mineralization. When integrated with the RC and channel sample data, these holes define a mineralized zone (MZ), extending for over 400 meters strike length trending north-north/east, that remains open to the north and south (Figure 3). The maximum width of the MZ at surface is 90 meters (section 0100S). Mineralization was defined to a maximum depth of 140 meters (TOURD006, Section 0000). Significant mineralized intercepts from holes drilled across the TSZ are tabulated in the adjacent PDF named Touro Drill Program.
Gold mineralization at Touro is hosted in sheared tonalites and diorites of Paleoproterozoic age. The principal MZ trends North-North/East within the dextral brittle-ductile TSZ. Intensely altered tonalites constitute the dominant host unit for the wide zones of gold mineralization. Tonalite alteration consists of silicification, sericitization, carbonatization, sulfidation, and albitization, along with introduced tourmaline and intense bleaching. Pyrite is the dominant sulfide mineral and constitutes up to 3% of the rock mass. Several sub-parallel narrow mineralized zones also cut the diorite (see cross-sections). Gold is also directly associated with quartz veins and stockworks. Three distinct sets have been mapped to date. Luna is working to identify additional mineralized structures and to generate data to support an initial resource estimate.