Main Ridge Project, Jamaica
The Main Ridge Project (MRP) consists of a wholly-owned Special Exclusive Prospecting License (SEPL) covering 30 sq. km. MRP is located within the west-central part of the highly tectonized altered and mineralized Cretaceous Central Inlier (Map 1). The Spaniards mined placer gold in the 16th Century within the Central Inlier. Limited exploration has been completed to date at the MRP.
The geologic history of subduction, crustal thickening and tectonism has produced extensive mineralization within areas of Cretaceous rock throughout the Caribbean (Map 2), such as at the Pueblo Viejo deposit, which contains more than 36 million ounces of gold and 930 million pounds of copper.
Exploration and prospecting, namely soil sampling and limited prospecting by BHP and others, during the 1990s demonstrate the excellent potential at MRP for economically-viable epithermal gold and gold-copper porphyry and oxides deposits. A Canadian International Development Agency (CIDA) stream sediment sampling program indicates the presence of gold and copper in the Main Ridge area. (Gold Map 3a and Copper Map 3b).
BHP discovered a 6 km structurally-controlled gold in soil anomaly which crosses the MRP (Map 4). This anomaly also crosses the Pennants gold mine, a high grade (Jorc Resource 94,400t @ 13.9g Au/t) small mining operation. The deposit at Pennants is open at depth and along strike.
A broad copper in soil anomaly is located over the crest of Main Ridge suggesting that it is underlain by a significant sized copper porphyry. High copper soil values and rock samples (0.84% Cu over 1 m) in the volcanic agglomerates flanking Main Ridge (Map 5) indicate the potential for a large oxide deposit.
Carube plans to concentrate on (1) determining the extent of the epithermal gold mineralization and (2) the extent and grade of the copper porphyry and oxide mineralization.
Bennett Gold Zone
Highlights of the recent Carube work include:
Figure 1: Main Ridge Project area, showing gold in soils and high grade gold in rocks collected at the Donkey Hill, Mango Valley and Silver Fish prospects in respect to the former Pennants Open Pit gold mine. Pennants gold mine does not occur within Carube’s Main Ridge SEPL.
Ongoing mapping at Main Ridge continues to identify high grade gold mineralization associated with a low angle northwest trending structure. High grade mineralization appears to be associated with dilational jogs, developed at the intersection of the low angle northwest structures and cross cutting steeply dipping northeast structures. The width of mapped low angle structures is variable, but locally up to 10 metres in apparent thickness. Historical drill data intersected bonanza gold grades at Pennants (historical resource of 75,500t at 20.4g/t gold 1 & 2), including individual drill core sample assays above the upper assay limit of 500g/t gold. Two historical holes (MD28 and MD6, Figure 1) were drilled within Carube’s Mango Valley prospect area by AusJam and reported 3.1m @ 17.0g/t gold in MD28 and 1.4m @ 2.7g/t gold in MD6 (drill results are historical in nature and have not been independently confirmed3).
1 Published report, Geochemical exploration for gold in Jamaica: A comparison of stream sediment and soil surveys, Geochemistry: Exploration, Environment, Analysis, 4, 161-170, 1 May 2004, authored by Robert G. Garrett, Gerald C. Lalor.
2 The mineral reserve cited above is presented as a historical estimate and uses historical terminology which does not conform to current NI43-101 standards. A qualified person has not done sufficient work to classify the historical estimate as current mineral resources or mineral reserves. Although the historical estimates are believed to be based on reasonable assumptions, they were calculated prior to the implementation of National Instrument 43-101. These historical estimates do not meet current standards as defined under sections 1.2 and 1.3 of NI 43-101; consequently, the issuer is not treating the historical estimate as current mineral resources or mineral reserves.
3 Data from the above drill results are historical results and it is unknown what type of quality-control programs were performed at the time. The QP also advises that true width of the above results cannot be determined at this time.
Mango Valley prospect: mapping identified zones of intense white clay alteration associated with a northwest trending structure, which appears to be the same structure that controls the gold mineralization at Pennants deposit. Shallow to steeply dipping mm to cm scale quartz carbonate veins were mapped and sampled in this area, with a 50cm channel sample assaying 19.3g/t gold.
Donkey Hill prospect: a one-meter channel collected across a northwest trending quartz vein assayed 12g/t gold and numerous rock chip grab samples assayed more then 1g/t gold (Figure 1).
Silver Fish prospect: interpreted higher level quartz-barite-carbonate and hematite are common characteristics of the veins observed in this area. A prominent fault zone contains bluish gray clay, pyrite and fragmented quartz vein material, varying in true thickness from 50cm to 6 meters and grab samples assayed up to 1.7g/t gold. The concentration of stockwork veining at Silver Fish shows a similar pattern to that of Donkey hill wherein the stockworks are found on the intersections of northeast and northwest trending structures.
Figure 2: Photos showing different vein styles at Main Ridge, including a quartz-carbonate vein that assayed 13.9 g/t Au (right) and outcrops 560m west of Pennants open pit.
Management is encouraged by the initial results of the surface mapping and sampling conducted at MR. The identification of shear zones containing auriferous quartz veining in bedrock continues to support the potential for a southeast-northwest trending zone that is contiguous with the structure that is host to the Pennants gold deposit. The exploration team will continue the mapping and sampling campaign west of the former Pennants mine and initiate detailed mapping and sampling to the southeast within Carube’s Main Ridge Special Exclusive Prospecting License (SEPL) tenement. The fast tracking of detailed exploration activities should enable Carube to prioritize targets for drill testing.
Soil samples were collected from 195 sites at 30m intervals on 8 in-fill lines on the 2 km long, WNW trending Bennett Gold Zone that had been previously defined by BHP-Utah in the 1990s. BHP-Utah’s and Carube Copper’s sampling clearly outline parallel, predominantly E-W, elongated anomalies (Map 6). Contoured patterns of values in excess of 12 ppb Au, commonly greater than 30 ppb Au and up to 610 ppb Au define parallel anomalies, in one case over an unbroken distance of 1100m. In some instances, highly anomalous nodes in Au up to 100m long are present in areas of suspected intersecting mineralization.
The anomalies are interpreted as being the surface trace of steeply dipping epithermal quartz-carbonate veins similar to those that were mined at the Pennants Gold Mine. A number of historical intersections of veins have been reported on the licence from near the eastern end of Bennett Gold Zone: 7.69 gAu/t over 3m from one hole; 3 gAu/t over 2.2m and 22.9 gAu/t over 2m from a second hole: and 2 gAu/t from a third hole. At the former Pennants Gold Mine, values of 3 to 5m true width from drill core, commonly assayed from 6 - 8 gAu/t, frequently exceeding 10 gAu/t. Reported production at Pennants was 95,725 t at 9.01 gAu/t.
Orange Hill Copper Prospect
Soil samples were collected from 350 sites on a 100m square grid, covering a 3.7 sq. km. area in the west part of the Main Ridge License. Results from the soil sampling indicated two, possibly three, large distinctive areas marked by anomalous results for numerous elements. The results from each area imply the presence of separate underlying mineralization systems. The geochemical results also suggest the presence of epithermal veining and mineral enhancement (overprinting).
A large 1.7 sq. km. copper (Cu) in soil (greater than 240 ppm) is obvious in the area around Orange Hill (Map 7). It appears to be divisible into two separate anomalies: (i) a northern lobe that measures 500m by 1500m and (ii) a southern lobe that measures 600m by 1500m and is open to the SE. Both lobes have their long axis trending to the NW. The northern lobe is marked by a 300m by 900m N-S trending anomaly where Cu values are greater than 360 ppm and between 450 and 1360 ppm. The southern lobe shows variation in the area of Cu enhancement - some of the Cu overprinting trends E-W. Gold anomalies marked by values greater than 6 ppb and values between 12 and 53 ppb, show similar patterns. Other precious and base metals show N-S trending narrow anomalies. The 39 rocks (grab samples) that were collected during prospecting were highly altered and most assayed greater than 250 ppm Cu. One sample from the southern lobe assayed 2.29% Cu.
The area’s Cu and Au potential had previously been inferred because of the presence of a large residual gravity high (possibly indicative of a mid-crustal intrusive) and a large magnetic body topping at 150m below surface and with associated lobes (indicative of magnetite alteration compatible with porphyry or IOCG related alteration). Stream sediment sampling by The Canadian International Development Agency (CIDA) in the 1990s and a soil sampling transect by Carube Copper in 2015 across the area confirmed the presence of Cu-Au mineralization in the area.
 Pyle, P.F. 1992. Main Ridge Gold Project, Clarendon, Jamaica; unpublished reports, March and August for BHP-Utah Exploration Inc with analytical reports by Chemex Labs Inc, Sparks, Nevada
 Lutynski, P. 1994. Summary, report, Central Inlier Project, Jamaica; Clarendon Mining Ltd., unpublished technical report
 Exploration Management Pty Ltd. 2012. Main Ridge gold Mine (Jamaica); web-site
 Tykajlo, R. 2016. Main Ridge Project, Jamaica; geophysical data processing, modelling, interpretation and targeting; Geo-Digit- Ex memorandum to Carube Copper.
 Rodinia Jamaica Ltd. 2015. Semi-annual report for the Main Ridge Project area, July 1, 2014 to December 31, 2014; prepared by Jeff Ackert and Trevor McCain, Carube Copper Corp.