Peregrine Diamonds Ltd. provides an update on activities at its 100 percent-owned Chidliak project , located on Baffin Island, 120 kilometres from Iqaluit, the capital of Nunavut, Canada. The Chidliak summer exploration program operated by De Beers Canada Inc. (“De Beers”) was completed on August 19. Highlights from this program include the discovery by De Beers of two new kimberlites and the discovery of a kimberlite dyke by government geologists. In addition, possible kimberlite float, which is undergoing final petrographic confirmation by De Beers, was found in numerous other locations.
The De Beers summer exploration program at Chidliak included the evaluation of priority geophysical anomalies by prospecting, orientation geophysical surveys, and bedrock and surficial mapping. During the course of the program, De Beers field teams discovered two new kimberlite occurrences and numerous occurrences of possible kimberlite float requiring additional work before being confirmed. The first confirmed discovery is a kimberlite dyke approximately one metre wide associated with a circular magnetic anomaly with an estimated surface expression from ground magnetics of approximately 0.5 hectares. At the second site, kimberlite float was found associated with a circular geophysical anomaly that has an estimated surface expression from airborne magnetics of approximately 0.5 hectares. Concurrent with the De Beers Chidliak exploration program, the Canada Nunavut Geoscience Office (“CNGO”) conducted a bedrock and surficial mapping program over a portion of the Hall Peninsula of Baffin Island. During the course of their fieldwork, the CNGO reported the discovery of a new kimberlite dyke on the Project. In total three new confirmed kimberlites have been discovered in 2013 bringing the total number of kimberlites at Chidliak to 64.
De Beers completed ground geophysical orientation surveys over twelve known kimberlites using the following methods: gravity, electromagnetics, ground penetrating radar and magnetics. The results from these surveys will be used to determine the most effective geophysical technique for discovering additional kimberlites in future exploration programs. To date initial results from the gravity surveys have been reviewed by Peregrine and indicate that most of the known kimberlites that were surveyed have a strong gravity response. Prior to this year, no gravity surveys had been executed on the Project. Peregrine believes that gravity could play a key role in future kimberlite discoveries at Chidliak. A complete summary of the summer exploration program, including confirmation of additional kimberlite discoveries, and results from the other geophysical surveys will be provided after all information from the program has been evaluated by Peregrine.
North Arrow began exploring kimberlite trains on new properties acquired in the Kivalliq and Baffin regions using an airborne magnetic survey. Flown by contractor Tundra Airborne Surveys in Ontario, the Diamond DA-42 Twin Star is a state-of-the-art, composite aircraft outfitted with wing tip pods for the magnetometers and a nose stinger for a VLF-EM receiver.
photo courtesy of John Charlton
North Arrow looking for diamond indicators after acquiring new properties
Northern News Services
Published Monday, August 12, 2013
North Arrow Minerals Inc. has had a plane in the air for the past several weeks near Chesterfield Inlet and Hall Beach in search of kimberlite trains.
The British Columbia-based junior exploration company acquired two kimberlite projects in the Baffin and Kivalliq regions last month as part of its new focus on hunting for Northern diamonds.
“The North is an area where there’s been a real history of successful diamond exploration in Canada and it’s a good place to be exploring,” said Ken Armstrong, North Arrow president and CEO. “With the general lack of diamond exploration activity – exploration activity in general, but diamond exploration activity, as well – we’re just looking to take advantage of the fact that there are public data sets and information out there that indicate there are unexplained targets and areas that we think are quite prospective in the North.”
North Arrow’s new properties include the Mel project, which consists of approximately 74,057 hectares on the Melville Peninsula, located 140 kilometres south of Hall Beach, and the Luxx project, which consists of approximately 40,468 hectares on tidewater 60 km from Chesterfield Inlet.
Unexplained kimberlite indicator mineral trains have been documented by past exploration activity in each region, according to public data filed with the federal government in accordance with the Nunavut and Northwest Territories Mining Regulations.
Stornoway Diamond Corporation filed results of work done in the Mel area as part of its Aviat project on the Melville Peninsula. Shear Minerals Ltd. filed results of work done in the Luxx area as part of a large exploration program in the region associated with its Churchill Diamond Project to the south.
“There could still very well be some undiscovered kimberlite in those localities,” Armstrong said. “So, it’s taking advantage of that public information to identify areas that we believe still are prospective for the discovery of new kimberlites and, ideally, diamondiferous kimberlites.”
Mel, which is 210 kilometres northeast of North Arrow’s Qilalugaq diamond project near Repulse Bay, is located within 10 km of tidewater and contains two kimberlite trains defined from more than 500 till samples recorded in Stornoway’s public assessment files, according to Armstrong. Luxx contains at least one kimberlite train, defined from more than 350 till samples in public assessment records filed by Shear, located within 20 km of the Churchill kimberlite cluster.
North Arrow began exploring both properties last month using an airborne magnetic survey, flown by contractor Tundra Airborne Surveys out of Ontario. The collection and preliminary analysis of the data should be complete soon, Armstrong said, adding the company will follow up with till sampling to confirm and better define the composition of kimberlite indicator minerals.
The Peregrine Diamonds Ltd. 2011 program has two primary objectives:
The main work activities approved for 2011 include the following:
Field work has commenced at Chidliak with the construction of a third exploration camp, named Aurora, located 42 kilometres north of the Discovery Camp, and the initiation of ground and airborne geophysical surveying. Drilling of lake-based targets in the northern portion of the Project is scheduled to commence this week. Lake ice conditions are expected to support on-ice drilling until at least mid-May. The first two drilling locations will be the CH-17 kimberlite and anomaly 165, located 200 metres south of CH-17 and three kilometres north of Aurora Camp. In April and May, a second core drill and an RC rig will be utilized to test targets in the central portion of Chidliak.
Peregrine geophysicists have recently selected 21 geophysical anomalies over two hectares in size for follow-up this year, four of which are interpreted to be greater than 4.5 hectares. Many of these anomalies display magnetic/electromagnetic responses similar to the large CH-31 and CH-33 kimberlites. These anomalies will be evaluated by ground geophysics this winter and priority targets will be drilled this year. The Company also expects to generate additional large targets this spring from the 12,000 line-kilometre RESOLVE heli-borne survey that is currently being flown.
The 2011 Qilaq exploration programme will begin in the spring with a 4,000 line kilometre airborne geophysical survey centred on two areas defined by anomalous KIM samples, one of which hosts the Q1 and Q2 kimberlites. The airborne survey will be followed by ground geophysical surveying, KIM sampling and a drill programme that will focus on the drilling of the Q1 and Q2 kimberlites as well as any new priority kimberlite targets generated from the geophysical surveys. The KIM sampling will be conducted within the areas targeted for airborne geophysics as well as within other anomalous areas that were confirmed in 2010.
Qilaq is 4,370 square kilometres in size, and borders Chidliak to the north, east and south. In 2010, 387 sediment samples were collected for kimberlite indicator mineral (“KIM”) processing, 476 sediment and 120 rock samples were collected for multi-element geochemistry and a 670 line-kilometre helicopter-borne electromagnetic/magnetic geophysical survey was flown. As reported on October 6, 2010, two diamondiferous kimberlites were discovered at surface in the northeastern portion of Qilaq, Q1 and Q2. The results from Q2 were especially encouraging with a 242 kg sample yielding 253 diamonds larger than the 0.106 mm sieve size including three stones larger than the 0.600 mm sieve size. In August and September 2010, a follow-up prospecting, mapping and sampling programme was conducted to evaluate 23 sites with anomalous orogenic gold or magmatic nickel-copper-cobalt-platinum group element signatures.
Peregrine Diamonds Ltd. reports the discovery of 12 new kimberlites and the successful completion of the summer exploration programme at the Chidliak project on Baffin Island, Nunavut, Canada. Previous posts: http://explorationgeophysics.info/?s=peregrine. These 12 new discoveries bring the total number of kimberlites discovered to date on the Project to 50, of which 34 have been discovered in 2010. Eight of the new kimberlites were discovered by reverse circulation (“RC”) drilling, one by core drilling and three by prospecting. In addition, 11 core holes and ten RC holes were drilled into six previously identified kimberlites to increase the understanding of their size and diamond potential.
Seven of the kimberlites discovered to date are likely to be greater than one hectare in size based on drill data and ground geophysical signatures. Highlighting the probability for large kimberlites and associated tonnage at Chidliak is CH-31, where interpretation of the geophysical and drill data and the distribution of kimberlite float indicate that this kimberlite is over five hectares in size. A 410 metre kimberlite intersection was drilled at CH-31 in a core hole inclined at a 45 degree angle, which equates to an estimated horizontal width of at least 290 metres.
Mr. Eric Friedland, Peregrine’s CEO, said “We continued to discover kimberlites at an unprecedented rate at Chidliak this summer, averaging one kimberlite discovery every two and a half days. This new Canadian diamond district now stretches approximately 70 kilometres in a north-south direction and 40 kilometres east-west and we are confident that Chidliak hosts additional kimberlites with economic diamond potential. There are currently over 300 kimberlite-type geophysical anomalies within the existing airborne geophysical coverage to be evaluated beginning next field season. Also, two kimberlites were discovered this year on our adjacent, 100%-owned Qilaq project, further expanding this phenomenal diamond exploration region.”
Mr. Brooke Clements, Peregrine’s President, said “The discovery of 34 new kimberlites this year by our team at Chidliak further illustrates the very strong exploration potential of this diamond district. We are looking forward to a steady stream of diamond results over the coming months as we prepare for an ambitious 2011 exploration programme. The RC drill rig is perfect for rapidly testing kimberlite targets, and it will be an important exploration tool in future programmes. A very important milestone achieved this year was the discovery of several larger kimberlites with geophysical characteristics that differ from those of the majority of the known kimberlites. The confirmed presence of larger kimberlite bodies and the excellent potential for additional large-scale discoveries further heightens the economic upside of this Project.”
An exploration summary showing several of the new kimberlite discoveries is available at the following linkhttp://www.pdiam.com/i/pdf/chidliak189.pdf.
Eight new Kimberlites Discovered by RC Drilling
The lightweight RC drill rig, which began operating in early August, has proven to be an efficient exploration tool for rapidly testing geophysical anomalies. The primary objective of this year’s RC drilling campaign was to drill-test as many kimberlite-type geophysical anomalies as possible in a short time period, and to obtain material for a preliminary assessment of the diamond potential of any new kimberlites discovered. The CH-39, CH-40, CH-42 through CH-46 and CH-48 kimberlites were discovered in August and September and 24 anomalies were drilled without intersecting kimberlite. For each of the eight RC discoveries, at least one hole was drilled into the kimberlite with a minimum intercept length of 16 metres, providing sufficient kimberlite chips to complete diamond analysis by caustic fusion at the SRC. The RC discoveries will be evaluated using a core rig next year if diamond results warrant.
CH-41 Kimberlite Discovered by Core Drilling
The CH-41 kimberlite was discovered by drilling a magnetic high geophysical anomaly with an estimated surface expression of 0.5 hectares as determined by ground geophysics. Two inclined holes were drilled across the kimberlite from the same setup and magmatic kimberlite was encountered.
Three New Kimberlites Discovered by Prospecting
The CH-47 kimberlite was discovered when abundant kimberlite float was found on the shore of a small circular lake hosting an isolated, circular magnetic high anomaly with an estimated surface expression of one hectare as determined by ground geophysics. The kimberlite is highly altered but contains olivine macrocrysts and country rock xenoliths.
On September 12, the CH-50 kimberlite was discovered when abundant magmatic kimberlite float was found along a north-south trending magnetic high linear feature in an area of anomalous kimberlite indicator mineral (“KIM”) samples.
2010 EXPLORATION PROGRAMME SUMMARY
Following is a summary of the major accomplishments in the 2010 Chidliak exploration programme:
2011 EXPLORATION PROGRAMME
Peregrine and BHP Billiton have begun planning for the 2011 exploration programme at Chidliak. At this time the partners expect that the 2011 programme will be at least of a similar scale to the 2010 programme with two principle objectives, the further investigation of kimberlites demonstrating economic potential and the continued rapid discovery of new kimberlites. Peregrine will be the operator of the 2011 exploration programme.
Shear Minerals Ltd. today announced the discovery of the new high interest SAZ kimberlite float and the commencement of the $500,000 exploration program at the Chesterfield Inlet Diamond Project, Nunavut in partnership with Rio Tinto Exploration Canada Inc. (“Rio”) and Stornoway Diamond Corporation.
Already completed this year is a 2,346 line km ultra-high resolution airborne magnetic geophysical survey over two priority blocks by Aeroquest. A total of 33 priority targets have been chosen as large tonnage kimberlite targets. A 10-person experienced crew is currently at the Josephine Lake Camp and will follow up targeted anomalies on the ground. A total of 7-10 high priority targets will be tested using a lightweight reverse circulation percussion drill (tests one target per day).
“The goal for this project in 2010 is to discover new kimberlites with large tonnage potential. The discovery of the new SAZ kimberlite float suggests the presence of high diamond potential kimberlites in the Chesterfield area,” said Pamela Strand, President and CEO of Shear Minerals Ltd. “With drilling now underway we hope to quickly confirm whether a target is a high diamond potential kimberlite to warrant further follow-up.”
SAZ Kimberlite Float
The SAZ kimberlite float was discovered by prospecting in a series of nine frost boils within a 65m area. The kimberlite fragments are weakly magnetic, angular and are believed to be proximal to the source. Visually the kimberlite is described as being ‘typical’ of the high diamond potential kimberlites at Churchill (“Type B”) with large olivine macrocrysts, green-blue phlogopite and visible pyrope garnets. Samples have been collected for diamond analysis by way of caustic fusion as well as petrography. Plans are to review the geophysics with continued prospecting in this immediate area.
About the Project and Shear Minerals
The Project comprises a group of 35 mineral claims (70,000 acres) located within and near the North Corridor of the larger Churchill Diamond Project. The Project area is located approximately 15 km north of the Josephine River Corridor. This area covers the North Corridor, an indicator mineral dispersion area based on till samples from 2003-2006 having high count probe-confirmed kimberlitic indicator minerals including pyrope garnet, eclogitic garnet, chrome diopside, ilmenite and chromite.
Peregrine Diamonds Ltd. reports the discovery of two new kimberlites, named Q1 and Q2, by prospecting on the Company’s 854,000 hectare Qilaq project (“Qilaq” or “the Project”) on Baffin Island, Nunavut, Canada. Qilaq is located on Hall Peninsula, northeast of Iqaluit, the capital of Nunavut, and is adjacent to Peregrine’s Chidliak project (“Chidliak”) where, as reported in a news release on August 4, 2010, the Company has discovered 32 kimberlites in the past two years.
In the spring of this year, Peregrine conducted a 670 line-kilometre helicopter airborne geophysical survey on what represents less than 2% of Qilaq’s area. The 12 geophysical anomalies that were found from this limited survey were prospected and will be prioritized for ground geophysics to be followed by drilling next year. A larger airborne geophysical survey is also being planned for next spring.
Mr. Eric Friedland, Peregrine’s CEO stated “The recent discovery of two kimberlites at surface at Qilaq by prospecting shows that the kimberlite district we have discovered on south Baffin Island continues to expand substantially in area and that this region has excellent potential to host another Canadian diamond mine. Our targeting and exploration methods are producing new kimberlite discoveries at a very rapid pace in Nunavut, and we look forward to more discoveries at Qilaq in the near future. The fact that Qilaq is wholly-owned by Peregrine is especially exciting for our shareholders as it allows us to benefit fully from the value that could result from the potential development of the Project.”
The spring 2010 helicopter-borne magnetic/electromagnetic geophysical survey revealed a magnetic high anomaly with an estimated diameter of 150 metres associated with a topographic depression that measures approximately 60 metres by 50 metres. Subsequent prospecting led to the discovery of the Q1 kimberlite, represented by large concentrations of coarse-grained KIMs, and kimberlite cobbles and boulders on the surface. Both magmatic kimberlite and probable weathered kimberlite breccia boulders were identified. Pyrope garnet, picroilmenite and chrome diopside grains over 10 millimetres in size were observed on the surface. Clasts of limestone, shale and sandstone, interpreted to have weathered from the kimberlite, are also present on the surface.
The Q2 kimberlite is located approximately four kilometres south of the Q1 kimberlite and outside of the 2010 airborne geophysical survey. Q2 was discovered through the identification of kimberlite boulders by a field crew that was collecting a follow-up till sample. Subsequent prospecting led to the discovery of two kimberlite outcrops within a surface depression that is more than 80 metres in diameter. At least two phases of kimberlite were identified. One phase is described as being magmatic without limestone xenoliths and the other phase has coarser grained olivine and KIMs and contains limestone xenoliths. Both phases contain olivine, picroilmenite, pyrope garnet and chrome diopside macrocrysts.
Samples from the Q1 and Q2 kimberlites are being sent to the Saskatchewan Research Council for diamond analysis by caustic fusion and results will be reported as they become available. If the diamond results are positive, Q1 and Q2 will be scheduled for drilling as early as possible next year. An exploration summary showing the two new kimberlite discoveries is available athttp://www.pdiam.com/i/pdf/qilaq632.pdf.
QILAQ EXPLORATION UPDATE
Over 300 follow-up sediment samples, related to the seven KIM anomalies identified in 2009, are currently being collected in addition to the prospecting of anomalies revealed from the 2010 airborne geophysical survey in anticipation of a drilling program that is being planned for the next field season. Follow-up geochemical and rock sampling, prospecting and mapping related to precious metals anomalies identified in 2009 is also underway this field season.
Peregrine Diamonds Ltd. reports the discovery of the CH-17 kimberlite on the Chidliak project on Baffin Island, Nunavut, Canada. The discovery of CH-17, 35 kilometres north of the nearest known kimberlites, CH-6 and CH-10, is further confirmation that Chidliak is a highly prospective and large Canadian diamond district. Formerly geophysical anomaly 166, CH-17 is the northernmost of two high-priority magnetic anomalies, 165 and 166, that have similar geophysical characteristics and are situated 200 metres apart under the same lake. Each of the anomalies has estimated surface expressions of at least one hectare. With this discovery, Peregrine management is confident that anomaly 165 is likely also a kimberlite.
The CH-17 drill core was described in the field as being macrocrystic olivine-rich kimberlite, containing country rock and mantle xenoliths, and abundant kimberlite indicator minerals. Pyrope garnet and chrome diopside grains up to 30 and 15 mm in size, respectively, were observed.
The CH-17 kimberlite is the first target drilled this year and the seventeenth kimberlite discovered at Chidliak since 2008. The discovery was made by drilling a vertical core hole from lake-ice into the centre of the high-priority magnetic anomaly and kimberlite was intersected underneath 41 metres of water and 2.5 metres of overburden. Three metres of kimberlite drill core was recovered before the hole was terminated due to drilling difficulties. A map showing CH-17 and the adjacent anomaly 165, and photographs of drill core, are available at: http://www.pdiam.com/i/pdf/chidliak613.pdf.
A second hole was not immediately attempted at CH-17 to allow for a thorough review and analysis of the drilling issues by Peregrine and the drilling contractor. While awaiting delivery of drill supplies, a geophysical anomaly 1.6 kilometres north of CH-17 was drilled because of its proximity to a favourable kimberlitic indicator mineral train. No kimberlite was intersected and the anomaly was explained by magnetic gabbro. The indicator mineral train is now interpreted as having likely originated from CH-17 and anomaly 165.
Since the CH-17 discovery hole was terminated on May 3, there have been ten days where weather did not allow access to the drill because of low visibility and/or high winds and blowing snow. In addition, unseasonably warm local weather has led to the formation of slush on the lake hosting CH-17 and anomaly 165. Both CH-17 and anomaly 165 cannot be efficiently drilled from the lake shore. For safety reasons, after a comprehensive analysis by an independent ice engineer, Peregrine has decided to postpone further drilling on the lake-ice at this particular locality until the spring of 2011. The drill is currently being moved to test two additional lake-based targets, anomalies 290 and 291 (see map at link noted above), that have more favourable lake-ice drilling conditions, and drilling is likely to commence in the next few days. Up to 30 land-based kimberlite targets are expected to be drilled this year during the spring and summer programmes at Chidliak.
Discoveries of high concentrations of kimberlitic indicator minerals (“KIMs”) on the 980,000 hectare Chidliak property in 2006 and 2007 encouraged Peregrine to look for new kimberlite deposits in the area due to the excellent potential for further diamond discovery. The property is located 150 km northeast of Iqaluit, capital of Nunavut. Three distinct and well-defined KIM anomalies situated 20 to 30 km apart were identified. Peregrine collected a total of 970 till samples at Chidliak in 2006 and 2007, of which 286 samples, or 29 percent, contained KIMs. The full suite of KIMs have been recovered from the property, including p-type pyrope garnet, eclogitic garnet, chrome diopside, picroilmenite, chromite and forsteritic olivine. A significant number of the KIMs were over 1.00 mm in size. Kimberlite mineral grains larger than 1.00 mm are not common and are often a strong indication of a proximal kimberlite source. Ten percent of the 2,284 p-type pyrope garnets that were analyzed by electron microprobe are classified as high-chrome, low-calcium G10 garnets. G10 garnets are commonly associated with diamond mines throughout the world. Based on the favorable indicator mineral results, a heliborne magnetic/electromagnetic survey commenced in July, 2008, the survey, flown at 100 metre line spacing, was completed in August.
The CH-1 kimberlite was discovered when a kimberlite outcrop within a circular magnetic anomaly selected from an airborne geophysical survey was identified.
The 2010 exploration programme is scheduled to commence in mid-May with ground geophysics. Ground magnetic and electromagnetic surveys will be conducted over priority geophysical anomalies that have been selected from previously completed airborne surveys. Kimberlite-type geophysical anomalies that have been prioritized based on their geophysical signatures and association with KIMs will be targeted for drilling. Drilling is scheduled to commence in early July on up to eight targets. New kimberlite discoveries will be tested for diamonds by caustic dissolution. In addition, up to 400 KIM samples will be collected as a follow-up to anomalies identified from previous exploration work.
A map showing the location of the known kimberlites and 2009 sample locations, images of four of the geophysical anomalies that will be evaluated by ground geophysics and/or drilling, and some photos of previous field work can be viewed at http://www.pdiam.com/i/pdf/nanuq826.pdf.
Exploration commenced at Nanuq in 2003. Between 2003 and 2007, 1,728 KIM samples were collected, 32,183 line kilometres of airborne geophysical surveys were flown and 591 line kilometres of ground magnetic surveys were completed. In 2007, three high priority magnetic low anomalies were drilled by the Company, resulting in the discovery of three diamond-bearing kimberlites, Tudlik (Sandpiper), Naturalik (Eagle) and Kayuu (Hawk), with estimated surface areas of one, seven and five hectares, respectively. The kimberlites at Nanuq are unique in the Western Churchill Province of the eastern Arctic in that they represent the first reported occurrence of “Lac de Gras-type” crater-facies volcaniclastic and resedimented volcaniclastic kimberlites in the region. They are also unique with respect to their late Cretaceous ages (70-80 million years) and are the youngest kimberlites known in the area.
2010 diamond exploration programme with a budget of $13.5 million has been approved by Peregrine Diamonds Ltd. for the 9,800 square kilometre Chidliak project on Baffin Island, Nunavut, Canada.
A helicopter-borne airborne geophysical survey will commence in March 2010. The survey will be designed to cover kimberlite indicator mineral anomalies not covered by the 2008 survey. The exact size and boundaries of the survey will be determined after all results from the 1,273 kimberlite indicator mineral samples collected in 2009 are received in February, 2010. Approximately 50 kimberlite-type anomalies will be evaluated by ground geophysical surveys during the spring and summer phases of the programme.
Discoveries of high concentrations of kimberlitic indicator minerals (“KIMs”) on the 980,000 hectare Chidliak property in 2006 and 2007 encouraged Peregrine to look for new kimberlite deposits in the area due to the excellent potential for further diamond discovery. The property is located 150 km northeast of Iqaluit, capital of Nunavut. Based on the favorable indicator mineral results, a heliborne magnetic/electromagnetic survey commenced in July, 2008, the survey, flown at 100 metre line spacing, was completed in August. In July, August and September 2008 Peregrine discovered the CH-1, CH-2 and CH-3 kimberlites, estimated at six, three and two hectares respectively. The CH-1 kimberlite was discovered when a kimberlite outcrop within a circular magnetic anomaly selected from an airborne geophysical survey was identified. A second kimberlite outcrop measuring approximately 20 metres by 25 metres was discovered in August, 2008, near the edge of an estimated three-hectare geophysical anomaly located 1.5 km from CH-1; this kimberlite was named CH-2.