Botswana Diamonds PLC Macro diamonds recovered from Marsfontein sample (2841O)
29 Mayo 2020 - 01:00AM
UK Regulatory
TIDMBOD
RNS Number : 2841O
Botswana Diamonds PLC
29 May 2020
29(th) May 2020
Botswana Diamonds PLC
("Botswana Diamonds" or the "Company")
Over 100 macro diamonds recovered from Marsfontein bulk
sample
Botswana Diamonds ("BOD"), the AIM and BSE listed diamond
explorer is pleased to announce that the company has concluded the
processing of two bulk samples taken from the Marsfontein diamond
development project in the Limpopo Province of South Africa. The
samples comprised 58-tons of fresh high-interest kimberlite and
62-tons of kimberlitic material from one of the residual
stockpiles, known as 'Dump E'.
Headlines
-- 87 macro diamonds were recovered from the fresh kimberlite
giving a modelled grade of 50cpht*.
-- 24 macro diamonds were recovered from Dump E giving a modelled grade of 16cpht*.
* Headline grades are quoted at a +1.5 mm screen bottom size cut
off
James Campbell, Managing Director commented "This bulk sampling
campaign, which was carried out with the company's royalty mining
contractor Eurafrican Diamond Corporation, had two objectives. The
first was to test the grade of the fresh kimberlite and the second
was to confirm the grades of one of the mine dumps. Both were
achieved, and proof of the fresh kimberlite grade paves the way for
further exploration work on Marsfontein to target potential blows.
The kimberlite grade is aligned with those achieved at Klipspringer
mine and Thorny River, which are both nearby, indicating the
considerable extent of the kimberlite dyke system. Options will be
investigated on exploitation of the dumps once the nationwide lock
down in South Africa is lifted and a sense of normality returns to
diamond markets, post the global Covid-19 pandemic crisis."
The results of the bulk sampling programme, including modelled
results are illustrated in the table below:
Source Sample No of Carats Raw Grade Average Largest Modelled Modelled
Size stones (cpht) stone stone Grade Grade
(tons) +1.7mm size cts cts (cpht) (cpht)
BCOS +1.5mm +1.0mm
BCOS BCOS
------------ ---------- --------- ---------
Kimberlite 58 87 16.53 28.5 0.19 2.28 50 53
Dump E 62 24 6.77 10.9 0.28 1.38 16 21
The fresh kimberlite was identified as originating from the M8
dyke system, which extends to the Klipspringer diamond mine c.11 km
to the west and the company's Thorny River project to c.5 km the
east. The Dump E material was predominantly a mix of M8 kimberlite
and dolerite.
Both samples were treated at Eurafrican Diamond Corporation's
processing facility. They were subjected to primary and secondary
crushing, pan plant concentration, grease and x-ray recovery and
jigging with a nominal bottom cut-off of +1.7mm. These tailings
have been retained for future analyses, as required.
The grade modelling was undertaken by Interlaced Consulting. It
assumed a conventional kimberlite processing plant, including a
re-crush circuit (to recover more finer diamonds).
Modelled results determined are in line with previous estimates
and diamond recoveries from the nearby Klipspringer diamond
mine.
Work will re-commence at Marsfontein and Thorny River as-soon-as
Covid-19 restrictions are lifted to enable travel to the work
areas.
Glossary
Diamond grades are always stated along with a Bottom Cut-Off
Size ('BCOS'). Diamond sizes follow a logarithmic distribution with
a peak in the finer sizes and a tail towards the coarser sizes. It
is a commercial decision selecting the bottom cut-off size and
typically for kimberlite processing plants this is +1.0 or
+1.5mm.
'CPHT' refers to Carats Per Hundred Tons and 'CTS' refers to
carats. Diamonds are weighed in carats. A carat is 0.2 grams and
the name comes from the fruit of the carob seed, a seed commonly
found in the Kimberley area of South Africa, one of the most
prolific historical diamond producing areas.
This release has been approved by James Campbell, Managing
Director of Botswana Diamonds plc, a qualified geologist
(Pr.Sci.Nat), a Fellow of the Southern African Institute of Mining
and Metallurgy, a Fellow of the Institute of Materials, Metals and
Mining (UK) and with over 34-years' experience in the diamond
sector.
This announcement contains inside information for the purposes
of Article 7 of Regulation (EU) 596/2014. The person who arranged
for the release of this announcement on behalf of the Company was
James Campbell, Director
A copy of this announcement is available on the Company's
website, at www.botswanadiamonds.co.uk
ENDS
Enquiries:
Botswana Diamonds PLC
John Teeling, Chairman +353 1 833 2833
James Campbell, Managing Director +27 83 457 3724
Jim Finn, Director +353 1 833 2833
Beaumont Cornish - Nominated Adviser
Michael Cornish
Roland Cornish +44 (0) 020 7628 3396
Beaumont Cornish Limited - Broker
Roland Cornish
Felicity Geidt +44 (0) 207 628 3396
Novum Securities Limited - Joint Broker
Colin Rowbury +44 (0) 20 399 9400
Blytheweigh - PR +44 (0) 207 138 3206
Megan Ray +44 (0) 207 138 3222
Rachael Brookes +44 (0) 207 138 3203
Teneo
Luke Hogg +353 (0) 1 661 4055
Alan Tyrrell +353 (0) 1 661 4055
Thomas Shortall +353 (0) 1 661 4055
www.botswanadiamonds.co.uk
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END
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