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Las Bolas Mineralized Trends
Las Bolas Generalized Section Looking North
Las Bolas Gold Silver Veins
Las Bolas
Underground Workings Drill Hole Plan
Las Bolas
Station 50 - 2009
Mapping & Sampling
Banded iron-manganese oxide vein with quartz
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Location and Claims
| The Las Bolas property comprises seven claims totaling 656.76 hectares: Los Hilos, Los Hilos II, Los Hilos II Frac.1, Mina de Las Bolas, Don Lazaro, El Manto, Ampliation La Verde.
Las Bolas is located in the centre of the Uruachic camp, at the intersection of thee major regional lineaments. |
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Claim Map (Click on image to enlarge) |
Las Bolas View (Click on the image to enlarge) |
Las Bolas Property Geology
The Las Bolas – Los Hilos project is underlain by the two main volcanic packages. The Lower Volcanic Series consists of gently tilted lavas, flow breccia, and tuffaceous rocks with a minimum thickness of 700 meters. It is conformably overlain by 100 to 200 meters of felsic latite volcaniclastic breccia. These units are overlain by the Upper Volcanic Series, which is a sub-horizontal volcaniclastic assemblage of mostly felsic ignimbrites and tuffs. The Upper and Lower Volcanic Series are separated by an unconformity that is manifest by a distinctive multi-lithic, poorly consolidated rubble zone of probable colluvial origin. Subsequent erosion formed a window exposing mineralized rocks of the Lower Volcanic Series in the Uruachic district.
Within the property the volcanic package reaches a thickness of approximately 700 meters from the bottom section near the Uruachic creek, where the El Manto Adit is located, up to the ridge top where Filo de Oro is located. The bottom contact of the volcanic pile lies unconformably over Precambrian basement rocks (gneiss). The volcanics are mainly andesitic tuffs, agglomerates and breccias of Cretaceous age; and overlying these are Tertiary rhyolites. Intusive rocks are predominantly small stocks of diorite, granodiorite and andesitic dikes. |
Mineralization
Las Bolas Fault-Fracture-Vein System:
The 2008-2009 detailed 1:50 scale underground structural and geological mapping concluded that four predominant mineralized fault-fracture-vein systems are repeated in the Las Bolas-Gambusino, Frijolar & El Corazon mineralized trends which cross the property in a roughly east west direction. These four fault-fracture-vein systems have the following orientations: a).Az 50°to 70° System; b). E-W System; c). N-S System; and d). Az 290°to 310°System.
Disseminated Bulk-tonnage Gold System:
In addition to the fault /fractures hosted mineralization in the Las Bolas-Gambusino,Frijolar, and El Corazon areas, about 1,100 metres to the east on the Los Hilos ridge an entirely new disseminated-bulk-tonnage gold mineralization system called Filo de Oro has been identified cross-cutting the three main mineralized trends. High grade, gold dominant veins run through Filo de Oro. The roughly north-south trending Filo de Oro Trend also hosts numerous old workings. The zone has been defined for over 400 metres and is open in all three directions. Please see Figure (Location Map of Filo de Oro & Mosca de Plata Section) Preliminary underground sampling of the Mosca de Plata workings, within the Filo de Oro system, for example has returned an average of 0.70 gms gold/tonne and 153 gms silver/tonne over its tested length of 46 metres. Nearby surface sampling returned an average of 0.82 gms gold/tonne and 40 gms silver/tonne for 79 samples. Additionally, 18 samples from a 40 metre long exposure of a 1.5 metre wide vein averaged 1.56 gms gold/tonne and 77 gms silver/tonne and in one location two contiguous samples across the structure averaged 10.2 gms gold and 257 gms silver/tonne.
The work on the Filo de Oro zone continues throughout early December 2009 and will resume in 2010 as part of the ongoing exploration of the Las Bolas property, which is also scheduled to include drilling and underground development.
Additional work by independent consultant Victor Jaramillo also shed light on the nature of the Las Bolas mineralization. In his 43-101 report he summarizes that he “believes that the Las Bolas-Los Hilos Property hosts an early stage mesothermal system of silver-lead-zinc veins followed by a later low sulphidation epithermal gold-silver event. Both systems are structurally controlled and confined mainly along fault zones as veins, silica stockworks and breccias.
Mesothermal vein systems are formed at considerable depths (from 600 m to 1000 m or more) by hydrothermal processes in a temperature range of 200°C to 300°C. The presence of dark gray quartz veins, cutting and brecciating the early silver-base metal mesothermal veins or oxide veins may be related to this later epithermal event. See image Banded iron-manganese oxide vein with quartz. |
Location Map of Filo de Oro (Click on the image to enlarge)
Filo de Oro Section (Click on the image to enlarge)
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2008-2009 Exploration
In November 2008, after completing 26 HQ diamond drill holes in the Las Bolas area, the Company started 1:50 scale detailed underground mapping & sampling in the Las Bolas, Gambusino and Frijolar tunnels resulting in greater understanding of the nature and distribution of the mineralization at a much lower cost compared to drilling. This comprehensive and successful work identified four main mineralized fault-fracture-vein system in these workings and established that mineralization is hosted in both the wall rocks as well as in the fault-fracture-veins system. This fault-fracture-veins system is repeated in the three major mineralized trends namely Las Bolas –Gambusino,Frijolar, & El Corazon mineralized trends that cross the Las Bolas property in a roughly east west direction. Please see figure Las Bolas Mineralized Trends. The following mineralized zones were delineated in the 2008-2009 underground exploration program. |
Las Bolas Mineralized Trends (Click on image to enlarge) |
Las Bolas Station 19:
Previous grab samples had indicated the presence of high grade silver in the fault-fracture-veins system in station 19. In 2009 the company took 98 two-metre centered chip samples over the strike length of 45m in four sub-levels of this stope. The detailed sampling on the four sublevels of the stope defined a 45 metre long interval with a weighted average grade of samples 1.25 gms gold/tonne and 577 gms silver/tonne with an average vein width of 2.12 metres. Please see Figure Las Bolas Station 19. |
Las Bolas Station 19 (Click on image to enlarge) |
Las Bolas Station 37:
About 200 metres further along the Las Bolas tunnel in the Station 37 stope area, similar work identified several high grade sections including a 30.6 metre length with a weighted average of samples 4.7 gms gold/tonne and 485 gms silver/tonne over an average vein width of 2.12 metres. The company took 137 two-metre centered chip samples across the veins as well as across the hanging wall and foot wall of the veins. Please see figure Las Bolas Station 37.
The planned follow up work for this area is to complete a new underground cross cut that will expose all of the veins in this area to allow for additional sampling to increase the resource as well as surface drilling in order to extend the proven strike length of the system. |
Las Bolas Station 37 (Click on image to enlarge) |
Frijolar II:
Frijolar & Frijolar II are hosted in the Frijolar mineralized trend. In 2003, Frjolar underground systematic chip sampling of the vein returned 0.14 gms gold/tonne and 319.6 gms silver/tonne over 55m length. In 2009 the company initiated 1:50 scale underground mapping of a newly found eastern continuation of the vein named Frijolar II followed by systematic two-metre centered chip sampling of the vein.The results are 30 chip samples assayed 281 gms silver/tonne over 43m length with an average vein width of 2.51m. Please see figure Frijolar II for details. |
Frijolar II (Click on image to enlarge) |
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