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Rich River Exploration Ltd.
Blacktop - Fox
INTRODUCTION
Conformable high grade zinc, copper, lead massive sulphide mineralization, was discovered in July 2000. It occurs within a sequence of Nicola volcanic and volcaniclastic rocks.
The Blacktop massive Sulphide showing is located right beside the Coquihalla Highway.
Gitennes Exploration Inc. acquired an option on the original FOX claims from the discoverer Michael Moore in September 2000. This new discovery created quite a bit of excitement.
BLACKTOP SHOWING
(Note large clear cut area in background)
LOCATION AND ACCESS
The Blacktop - Fox Property is located about 300 road-kilometres northeast of Vancouver, in the Nicola Mining Division, British Columbia. The city of Merritt lies about 30 kilometres to the south-southwest and the city of Kamloops is about 40 kilometres to the north-northeast.
Access to the property is via the four-lane Coquihalla Highway Connector, which connects Merritt to Kamloops.
The Helmer Lake exit is about 23 kilometres north of Merritt, providing access to either side of the highway. Numerous gravel-surfaced logging roads provide excellent access to most parts of the property from this exit.
A logging road from the Helmer Lake exit provides access to the area immediately west of the highway, where the bulk of Gitennes’ exploration work was done. The showing is roughly seven kilometres north along this western road.
HELMER LAKE ~ EXIT 315
LOCAL RESOURCES
Three power lines cross the property. A three-phase line for the provincial power grid passes diagonally across the northern property boundary. A smaller three-phase line crosses the property at the Helmer Lake exit. This line provides power to the mines at Logan Lake. A third single-phase line runs north from Nicola Lake along the Coquihalla Highway, providing power for the lights at the Helmer Lake exit.
PHYSIOGRAPHY
The property covers fairly gentle rolling terrain and the hills are generally rounded. In general relief is subdued. Local creeks do not cut steepsided valleys. Swamps are common along the larger stream drainage's. The local drainage pattern is strongly influenced by north-northwest to south-southeast-oriented Pleistocene glacial features. The Blacktop Showing is at an elevation of approximately 1,410 metres above sea level.
BLACKTOP FOX PROPERTY
ABOUT 60% OF THE PROPERTY HAS BEEN CLEAR CUT LOGGED RECENTLY, DUE TO THE MOUNTAIN PINE BEETLE
HISTORY
Most of the exploration in the area has been directed at a number of Cu and Pb-Zn showings in the Swakum Mountain area and nearby Cu-Mo-Wo Skarns. Mineralization was discovered in the 1970's on the south shores of Rey
Lake, hosted by a quartz monzonite intrusive.
Pb-Zn vein mineralization hosted by Nicola volcanics on the west shore of Helmer Lake was trenched during this same era. These Pb-Zn showings are now covered by the new Blacktop Fox property. They could be interpreted to be feeder veins to a VMS deposit.
PREVIOUS PROPERTY WORK
Gitennes Exploration Inc., commissioned a 475 line-kilometre airborne magnetic and electromagnetic survey. The survey outlined a linear magnetic low straddling the Coquihalla Connector over a length of at least 1,350 metres.
The Blacktop Showing occurs within this low. Several other EM targets have yet to be tested. These targets are in proximity to several drainages that have very high zinc in silt samples. One of these untested targets has zinc greater than 1000 ppm in silt.
Surface exploration on the property comprised geological mapping and evaluation of existing geological data, hand trenching on the Blacktop Showing, ground geophysics (magnetics IP, HLEM), and geochemical sampling (silt, MMI, and C -horizon soil). Reconnaissance geological mapping, prospecting and silt sampling were conducted along the numerous logging roads to aid in evaluating the Fox property.
The Highway Grid was established over the Blacktop showing area, with 50-metre spaced lines to control the geochemical MMI soil and geophysical surveys.
REGIONAL GEOLOGY (Moore and Pettipas, 1990),
Whose work represents the only detailed mapping that includes portions of the Fox Property. The area lies in the Intermontane Belt and is part of Quesnellia, except at the easternmost end where it is juxtaposed against high-grade metamorphic rocks of the Omineca Belt along the Okanagan shear zone. The western part is underlain primarily by Late Triassic arc-volcanic rocks and volcanogenic sedimentary facies of the Nicola Group, intruded by large Triassic-Jurassic plutons, among which the Guichon Creek batholith (McMillan, 1976, 1978) bounds the western end of the transect segment studied.
The Nicola Group rocks have been intruded by Triassic and Jurassic plutons, of which the Guichon Creek batholith
(McMillan, 1976, 1978) is the largest and most important from the metallogenic standpoint. The stratified rocks are complexly faulted and regionally metamorphosed, typically to lower greenschist facies.
PROPERTY GEOLOGY
The property is underlain by the western facies of the Late Triassic - Early Jurassic Nicola Group (Preto, 1979).
This facies consists of calcalkaline volcanic rocks and lesser epiclastic rocks, and is remarkable for the appearance of intermediate to felsic volcanic centres, such as that found at Iron Mountain. Mafic to intermediate Nicola volcanic rocks have fine-grained aphanitic matrices with abundant chlorite + epidote + calcite, commonly as fracture and vein fillings and less commonly as replacements of phenocrysts, matrix or clasts. Colour is usually dark green or dark purple.
The north-trending Clapperton Creek valley is thought to mark the trace of a major fault. It separates deformed Triassic to Upper Paleozoic amphibolite-rank volcanic, sedimentary and intrusive rocks of the Nicola Horst structural domain in the east from weakly foliated, greenschist-rank volcanic and sedimentary rocks of the Nicola Group western facies to the west.
BLACKTOP
MASSIVE SULPHIDES IN OUTCROP
BLACKTOP SHOWING GEOLOGY
The volcanic stratigraphy hosting the Blacktop Showing is separated into three major rock units, each one having distinctive structural and rock type features.
From west to east, these are:
Unit 3:
Coarse volcaniclastic hangingwall: The hangingwall comprises a heterogeneous mix of Nicola Group lithologies. It is not foliated, appears to be sub-greenschist rank in metamorphic grade, and often disrupted by brittle-appearing faults, rarely by undeformed Tertiary dykes, and can be densely veined and jointed. There are notable variations along strike within this unit.
Unit 2:
Deformed tuffaceous sequence and various intrusive rocks. These are Intermediate to felsic fine-grained volcaniclastic and intrusive rocks possessing a well-developed foliation.
The Blacktop mineralization horizon occurs at the top of unit 2. It is highly disrupted by a north trending, west-dipping fault named the Blacktop Fault. The fault cuts through the top of Unit 2 at a very oblique angle. The fault itself is readily recognized in core as it is a chaotic mix of hematitic and sericitic gouge and rock fragments with or without pieces of massive sulphide mineralization.
Unit 1:
Fine-grained mafic volcanic footwall comprising weakly foliated mafic tuff and waterlain tuff, interbedded with tuffaceous siltstone and wacke.
MINERALIZATION
The Blacktop Showing exposes a minimum width of 1 to 1.5 metres of massive sulphide mineralization, with a hanging wall of siliceous volcanic or chert, barite and disseminated sulphides. A gravel-filled drainage ditch obscures the base of the mineralised zone.
There are at least two styles of mineralisation:
(1) (On the left) Massive sphalerite-pyrite with chalcopyrite (up to several percent) with massive to semi-massive tetrahedrite.
(2) (On the right) Banded pyrite-sphalerite mineralisation with bands of massive pyrite that cut and enclose massive sphalerite-chalcopyrite and tetrahedrite bands.
The sample on the right is only seen in float. Samples of these float boulders assayed up to... 33.26% Zn, 3.22% Cu, 0.86% Pb, 144.7 g/t Ag and 1.06 g/t Au.
These float boulders could possibly represent a further undiscovered horizon of high grade polymetallic massive sulphide mineralization.
Chip sampling in the Sulphide Trench outcrop averaged 17% Zn, 1.6% Cu, 0.47% Pb, 76 g/tonne Ag and 0.49 g/tonne Au over
1.1 metres.
The Sulphide Pit, located 20 metres to the north, exposed 1.2 metres of the mineralized zone grading 5.96% Zn, 0.18% Cu, 0.07% Pb, 65.2 g/tonne Ag and 0.12 g/tonne Au.
The South trench, located 40 metres along strike consists of semi-massive sphalerite and pyrite mineralization. A chip sample returned a 1.0-metre interval with 2.31% Zn, 0.18% Pb, 0.19% Cu, 16.2 g/tonne Ag and 0.27 g/tonne Au.
The Blacktop Showing was the only zone on the property with a sufficiently advanced exploration target to warrant drilling at the time. The objective of the drill program was to drill test the high-grade Zn-Cu mineralization and its geochemical and geophysical trace down-dip to the west and along a 500-metre strike-length.
Eight holes totaling 1,234.7 metres were drilled from five sites along a 500-metre north-south strike length of the Blacktop Showing. All holes were collared west of the Blacktop Showing, at azimuth 092E and dips ranging from -45E to -85E.
The Blacktop reverse fault is marked by a major zone of hematitic
clay gouge that occurs immediately below the hangingwall contact.
INTERPRETATION & CONCLUSIONS
The drill program met its objective of testing the Blacktop Showing and its geochemical and geophysical trace both down-dip and along a 500 metre north-south strike. Mineralization similar to that exposed at the Blacktop Showing was intersected in F01-02. Adjacent holes F01-01, -03, -04, -05 & -08 intersected geochemically anomalous hematitic-sericitic fault gouge at the projection of the mineralized interval.
Unfortunately, movement of the Blacktop Fault has disrupted the massive sulphide mineralization. Nonetheless, the intensity of the alteration of Unit 2 rocks indicates that a strong hydrothermal alteration system was set up, and that additional discoveries of sulphide mineralization remain to be made.
Future exploration must focus upon the nature and extent of the
Blacktop Fault and locate targets either beyond its influence or where it will not have sliced-through the known mineralized (Blacktop Showing) horizon.
Geophysical EM and IP survey results can be now be reinterpreted by what was seen in drill core. Conductive zones and differences in resistivity are likely explained by the hanging wall contact, hematitic fault gouge, massive sulphide horizon, the footwall pyritic schist/phyllites and the contrasting physical properties of the different geological units.
Similarly, geochemically anomalous results may now be interpreted as the response from a large mineralized fault and
the underlying veined and altered felsic to intermediate deformed volcanic footwall sequence.
Nicola volcanic rocks both north and south of the drill area remain highly prospective for the discovery of other massive
sulphide mineralization. In particular, the rocks north of the Highway Grid that are not affected by the Blacktop Fault are considered to be a high priority for exploration.
Another possibility is a possible intrusive/volcanic centre that may be expressed in some of the hydrothermal breccias and coarse volcanic units seen in hole F01-07.
RECOMMENDATIONS
A continued, integrated approach to exploration at the Fox Property is recommended, utilizing similar geological,
geophysical and geochemical methods as those employed to date. The 2001 drill program, though not successful in finding a massive sulphide deposit, did establish that a prospective VMS environment exists at the Blacktop Showing.
Detailed mapping of the Highway Grid and the strike extents of the favourable horizon is necessary. Using this geologic knowledge and the drill core, a reinterpretation of the ground geophysics and geochemistry is in order.
Grid controlled MMI geochemical sampling, magnetic and VLF geophysical surveys accompanied by prospecting and geology have proven to be successful methods. This work should be expanded in scope to other areas of the property, to be followed by more detailed surveys such as IP, MAXMIN or other electromagnetic techniques, and if warranted, drilling. Further targets have already been delineated that warrant further exploration. These targets fall within areas that are now completely clear cut logged.
SOME OF THE MANY CLEAR-CUT AREAS ON THE BLACKTOP - FOX PROPERTY
Aspen Planers Ltd., a company located in Merritt, has timber rights that include the Fox Property. The area has seen a tremendous amount of recent clear-cut logging. This clear cutting is due to the presence of the mountain pine beetle.
Approximately 70 percent of the property has now been logged.
This logging and road building post dates the exploration conducted by Gitennes Exploration Inc. This new logging will also greatly facilitate cost effective future exploration programs on the property.
Several strong stream sediment anomalies, some up to (>1000 ppm zinc) as well as anomalous MMI soil sites and linear EM conductors, still remain to be prospected and sampled.
Some of these areas are well outside of the main areas of previous exploration.
Do to the nature of the high grade polymetallic mineralisation. The proximity to infrastructure, excellent access plus unanswered geological questions This property definitely warrants further exploration for an economic body of ore.
A 43-101 compliant report is available.
This property is offered for sale, by way of working option to purchase.
Contact us, for more detailed information.
Or to discuss participating in this project.
© COPYRIGHT (2008) RICH RIVER EXPLORATION LTD.
Site construction & design by C. A. Lynes
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