Posts Tagged kimberlites

Geophysical modelling suggests one of the world’s largest kimberite

Posted by on Wednesday, 16 October, 2013
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• Geophysical modeling suggests the Magi-Kimberlite at Pangolin’s Tsabong North Project in Botswana is a 270 hectare (2.7 km2) pipe
• Drilling intersects the kimberlite across 1,200 metres at an average 35 metres below surface
• New findings build on earlier discoveries at the same site: High pressure garnet indicators have previously been recovered 14 metres above the Magi-Kimberlite
• Two new kimberlite drill targets in Tsabong North, both more than 170 hectares (1.7 km2), have been identified by the geophysical modeling.
Pangolin Diamonds Corp. announced that it has discovered one of the largest kimberlites in the world, modeled at 270 hectares (2.7 km2), at its 100% owned Tsabong North Project (the “Project”) in Botswana.
A number of the world’s largest kimberlites include:
- Se251 in Angola, measuring 220 hectares (2.2 km2)
- MK1 in Botswana, measuring 180 hectares (1.8 km2)
- Mwadui in Tanzania, measuring 146 hectares (1.46 km2)
Kimberlite Discovery
The new discovery stems from Pangolin’s discovery earlier this year of two kimberlites, Magi-01 and Magi-02, at its Tsabong North Project.
Aeromagnetic data on those finds was submitted by Pangolin for independent review by Mr. Billy Steenkamp, of Xcalibur Airborne Geophysics of Pretoria, South Africa. Mr. Steenkamp is a Qualified Person under National Instrument 43-101 rules. His observations include the following:
• The previously reported Magi kimberlites are part of a single intrusive complex with a total surface area estimated at 270 Hectares (2.7 km2):
• Some of the selected intrusive kimberlite targets could be of syn- or pre-Karoo age; and
• Two new kimberlite drill targets have been identified with total intrusive areas modeled at 170 Hectares (1.7 km2) and 175 Hectares (1.75 km2).
Based on these observations, Pangolin drilled a new hole between the Magi-01 and Magi-02 kimberlites. The new hole positively intersected the same sandy tuffs recognized in the two previous drill holes, confirming that the Magi-Kimberlite is a single large body and not two smaller kimberlites as previously believed.
The Magi-Kimberlite has now been confirmed over a distance of 1,200 metres in an East-West direction. The average depth of intersection of the crater facies sediments is approximately 35 metres. The depths of intersection of the sandy tuffs vary between 55.3 and 61.5 metres.
Further work will begin shortly; seven additional holes have been laid out for core drilling to determine the final size of the Magi-Kimberlite. These core holes will also be used towards modeling the complex geology of the crater sediments and kimberlitic sandy tuffs in preparation for future possible larger diameter drilling. Each hole will intersect at least 100 metres of kimberlite to recover any additional indicator minerals, and any diamonds. One hole will be drilled to a minimum depth of 250 metres of kimberlite intersection.
Detailed logging of the core indicates that the Magi-Kimberlite is of syn-Karoo age. This makes it older than the Cretaceous diamondiferous kimberlites of the Tsabong kimberlite field further to the south, dated at 78 million years, but potentially similar in age to the Jwaneng kimberlites, dated at 245 million years.
Core samples from all the holes are being submitted to independent laboratories to recover any additional indicator minerals, and any diamonds. High pressure garnets originating deep in the earth’s mantle have previously been recovered from the Magi-1/1 drill core, 14 metres above the surface of the Magi-Kimberlite.
Dr Leon Daniels, PhD, Chairman of the Board of Pangolin, stated: “The geophysical models available to Pangolin strongly suggest the potential for discovering additional very large kimberlites in the Tsabong North Project area.”
About the Tsabong North Project

The Tsabong North Project, located approximately 100 km north of the town of Tsabong in south-western Botswana, is 1,545 km2 in size. It is comprised of anomalous concentrations of kimberlite indicators and has large geo-botanical features. Pangolin has identified more than 50 drill-ready aeromagnetic targets in the Project area, several of which have surface areas exceeding 20 Hectares (0.2 km2).
The Tsabong North Project is situated on the margin of the Archaean Kaapvaal Craton in a similar tectonic environment to the Orapa kimberlite field. The 45 mantle-derived garnets inclusive of the high pressure garnets were discovered in the drill core Magi-01/01. These garnets are very similar in chemical composition to the garnets from the Letlhakane Mine in the Orapa area.
Pangolin’s soil sampling has produced highly anomalous concentrations of kimberlite indicators within the Project area. Microprobe analyses of indicator minerals have confirmed the presence of G10 garnets, indicating the presence of a mantle conducive to the crystallization of diamonds. A number of indicators occur, including remnants of kelyphite that indicate close proximity to kimberlite. Enzyme-leach trace element results are consistent with orientation trace element results over known kimberlites near the Project.
The Company cautions that information regarding the Se251, MK1, Mwadui, and Orapa kimberlites, and Letlhakane Mine or Orapa Mine, are not necessarily indicative of the kimberlite or kimberlite targets being drilled by the Company. The Company further cautions that there is no guarantee that the kimberlite and/or kimberlite targets being drilled by the Company will return diamond results of any economic significance.

Geophysics for kimberlites on Baffin Island

Posted by on Monday, 9 September, 2013

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.


Magnetic survey in the Kivalliq and Baffin regions for kimberlites

Posted by on Tuesday, 3 September, 2013

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

Airplanes and kimberlite trains

North Arrow looking for diamond indicators after acquiring new properties

Daron Letts
Northern News Services
Published Monday, August 12, 2013

NWT/NUNAVUT
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.


2011 Diamond Exploration Program in Nunavut

Posted by on Monday, 28 March, 2011

The Peregrine Diamonds Ltd. 2011 program has two primary objectives:

  • Continued exploration focussed on discovering large kimberlites using new targeting information developed from the 2010 discovery of the CH-31 and CH-33 kimberlites. CH-31 is drill-confirmed at greater than five hectares in surface area, and new geophysical interpretations for CH-33 indicate potential for an elongated body with surface area greater than seven hectares.
  • Further evaluation of known kimberlites with economic potential by core drilling and/or mini-bulk sampling.

The main work activities approved for 2011 include the following:

  • Up to 13,000 metres of core and reverse circulation (“RC”) drilling with the following principle objectives:
    • Core and/or RC drilling of high-priority geophysical anomalies with large surface footprints that have been selected from airborne geophysical surveys conducted in 2008 and 2010, as well as priority targets that will be developed from the airborne survey that is currently underway.
    • Core drilling of the known high-interest kimberlite bodies to increase the understanding of their size, geology and diamond content.
  • Collection of a mini-bulk sample of approximately five tonnes by core drilling from the CH-31 kimberlite. CH-31 is estimated at over five hectares in size and an 840 kilogram microdiamond sample collected in 2010 returned 1.39 carats of commercial size (+0.85 mm) diamonds.
  • Collection of a 20 tonne mini-bulk sample from the surface of the CH-28 kimberlite. CH-28 is estimated at two hectares in size and a 239 kilogram microdiamond sample collected in 2010 returned 0.193 carats of commercial size (+0.85 mm) diamonds.
  • Completion of a 12,000 line-kilometre RESOLVE heli-borne magnetic-electromagnetic geophysical survey.
  • Ground geophysical surveys over anomalies selected from the 2008, 2010 and 2011 airborne geophysical surveys.
  • Indicator mineral sampling, ground geophysics and prospecting; 24 of the 50 currently known kimberlites have been discovered at surface by prospecting.
  • Initiation of preparations for a multi-kimberlite 2012 bulk sampling program.
  • Continuation of environmental baseline studies.

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.


2011 programme for kimberlites in Nunavut

Posted by on Tuesday, 15 February, 2011

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.


Reflection seismic for base metals

Posted by on Thursday, 10 February, 2011
Darnley Bay Resources Limited is currently preparing for the 2011 drilling program for base metals at its Paulatuk Property in the Northwest Territories. Two drill campaigns are planned, in winter/spring and summer/fall 2011. CEO Reford is currently in Paulatuk to lay the ground work for local hiring and to fine-tune the logistical aspects of the drilling. A reflection seismic survey is planned in February/March over drill targets to assess overburden conditions and optimize location of drill collars.
Darnley Bay Resources and Diadem Resources have an exploration partnership on the Franklin Diamond Project located on the Parry Peninsula, Northwest Territories.  Diadem has reported the following progress:
“A total of five diamond drill holes totaling 707.6 metres in length were drilled during August 2010 to test four (4) negative ground magnetic anomalies (anomalies MT112, MT113, MT102 and MT10) in an area where kimberlite intrusives were discovered in an earlier exploration program carried out in 2000 and 2001. One of the magnetic anomalies was tested with two holes.  In addition, ground-based total field magnetic surveys were carried out over three separate grids to evaluate anomalies detected in an earlier airborne magnetic survey carried out by Diadem.  As a result of this drilling, 3 new kimberlite intrusives were discovered. A single hole to test anomaly MT113 failed to intersect any evidence of kimberlite in the core.

Peregrine discovers more kimberlites at Chidliak – the new Canadian diamond district

Posted by on Thursday, 16 September, 2010

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:

  • Airborne Geophysics. Extensions to the existing 11,700 line kilometre 2008 aeromagnetic survey totalled 20,587 line kilometres.
  • Ground Geophysics. Approximately 1,800 line kilometres of ground geophysical surveys were completed over approximately 100 geophysical anomalies.
  • Prospecting. 112 geophysical anomalies were evaluated by prospecting, resulting in the discovery of 15 kimberlites.
  • Indicator Mineral Sampling. 404 KIM samples were collected.
  • Mini-bulk Sampling. Mini-bulk samples of approximately 50 and 15 tonnes, respectively, were collected from the CH-7 and CH-6 kimberlites.
  • Core Drilling. A total of 7,672 metres was drilled in 48 holes. Eleven new kimberlites were discovered, 19 holes were drilled into known kimberlites and eight anomalies were drilled without intersecting kimberlite.
  • RC Drilling. A total of 1,507 metres was drilled in 50 holes in 35 days. Thirty-four new anomalies were drilled, eight new kimberlites were discovered and RC drilling was completed on five known kimberlites.
  • Environmental Baseline Study. The second year of work on an environmental baseline study was completed and a weather station was commissioned.
  • Personnel. From mid-March to mid-June, 15 to 25 employees and contractors were on site at Chidliak at any given time, increasing to an average of 40 to 48 people between mid-June and early September.

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.


Ultra-high resolution magnetic survey for kimberlites

Posted by on Friday, 13 August, 2010

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’s new discovery

Posted by on Sunday, 8 August, 2010

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.”

Q1 KIMBERLITE

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.

Q2 KIMBERLITE

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.


The discovery!

Posted by on Thursday, 20 May, 2010

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.

More…


Peregrine’s geophysical program in Nunavut for 2010

Posted by on Wednesday, 28 April, 2010

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.

PROJECT HISTORY

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.


Chidliak exploration programme with airborne and ground geophysics

Posted by on Wednesday, 24 March, 2010
Peregrine Diamonds Ltd. reports the commencement of the Spring phase of the $13.5 million, 2010 diamond exploration programme on the 9,800 square kilometre Chidliak project on Baffin Island, Nunavut, Canada.
The Spring phase of the 2010 Chidliak exploration program commenced in the second week of March with site preparation. Airborne and ground geophysical surveying programmes are underway and core drilling is scheduled to commence in the third week of April. A heli-borne magnetic/electromagnetic geophysical survey of approximately 13,300 line kilometres at 100 metre line spacing is being flown by Fugro Airborne Surveys Corp. to complement the 11,700 line kilometre airborne geophysical survey that was completed in 2008. This year’s survey is designed to investigate at least ten kimberlite indicator mineral anomalies that were not covered by the 2008 survey. A six-person ground magnetic geophysical survey crew will evaluate up to 50 anomalies selected from the 2008 and 2010 airborne surveys and the highest priority targets will be drilled this year.
At least five lake-based, high priority kimberlite-type geophysical anomalies will be drilled from lake ice using a second drill rig that will be mobilized to Chidliak in mid-April. The first two anomalies scheduled for drilling are located 35 kilometres north of the nearest known diamondiferous kimberlites, CH-6 and CH-10. These two anomalies are approximately 200 metres apart and each has an estimated surface expression of at least one hectare.
There are some more details in The Northern Miner magazine: http://www.pdiam.com/i/pdf/TheNorthernMiner-PGDarticlereprint-08March10.pdf

Airborne and ground geophysics in $13.5 million Peregrine diamond project

Posted by on Monday, 21 December, 2009

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.

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