TIDMMTR
The issuer advises that the following replaces the Metal Tiger
Plc "Botswana Copper/Silver Project - T3 Mineral Resource Estimate
Upgraded" announcement released at 07:07 BST on 24 August,
2017.
Typographical errors in the original Table 1 have been
corrected.
All other details remain unchanged.
The full corrected version is shown below.
Metal Tiger Plc
24 August 2017
Metal Tiger Plc
("Metal Tiger" or the "Company")
Botswana Copper/Silver Project - T3 Mineral Resource Estimate
Upgraded
Metal Tiger plc (LON:MTR) the London Stock Exchange AIM listed
investor in strategic natural resource opportunities is pleased to
provide an update regarding the Company's Joint Venture ("JV")
project with partners MOD Resources (ASX:MOD) in the Kalahari
Copper Belt in Botswana (70% MOD Resources / 30% Metal Tiger).
Metal Tiger also holds 91,795,214 MOD shares, equivalent to 4.86%
of MOD's issued share capital and 1,541,667 MOD warrants at an
exercise price of 6 cents (Australian). Activities in Botswana are
conducted under the JV's local operating company Tshukudu Metals
Botswana (Pty) Ltd. ("Tshukudu").
Highlights:
-- Revised, JORC (2012) compliant, Mineral Resource Estimate
completed for T3 Project following inclusion of all drilling
results
from holes completed in first quarter 2017. Revised Resource
updates
and supersedes the previous, maiden, Mineral Resource
Estimate
(announced 26 September 2016).
-- Total (Measured, Indicated & Inferred) Mineral Resource
Estimate comprises 36.0Mt @ 1.14% Cu & 12.8g/t Ag
containing approximately 409kt copper and 14.8Moz silver
on a 100% basis (10.8Mt containing approximately 123kt
copper and 4.4Moz silver on a 30% attributable basis).
-- Constitutes a 27% increase in Total Resource tonnes a 16%
increase in contained copper compared with the Maiden Resource
(at 0.5%
Cu cut-off grade).
-- 25% of Total Resource tonnes now in Measured Resource
category (8.9Mt on a 100% basis and 2.7Mt on a 30%
attributable
basis @ 1.27% Cu & 12.5g/t Ag), denoting a higher degree of
Resource
confidence (at 0.5% Cu cut-off grade).
-- At a higher cut-off grade (1.0% Cu), the revised total Mineral
Resource Estimate comprises 20.6Mt on a 100% basis (6.2Mt on a
30%
attributable basis) at average grades of 1.43% Cu and 14.7g/t
Ag.
-- An additional low-grade Resource contains approximately 47.6kt copper
on a 100% basis (14.3kt on a 30% attributable basis) at 0.25%
Cu
cut-off grade.
-- The revised Resource model shows good grade continuity with horizontal
widths of >1% Cu mineralisation up to 180m across the planned
open-pit
design.
-- T3 (Phase 2) 2017 drilling programme currently underway with four rigs
to test further Resource extensions, underground potential
and
geophysical targets around T3. All six new holes completed to
date
have intersected significant visible copper mineralisation and
results
will be announced when assays are received and interpreted.
Michael McNeilly Chief Executive Officer of Metal Tiger
commented:
"The revised Mineral Resource Estimate is another important and
positive step towards the anticipated T3 Prefeasibility Study and
constitutes a significant upgrade to the Project with a 27%
increase in Total Resource tonnes and over 400,000 tonnes more
contained copper.
The 16% increase in contained copper has the potential to
increase the value and profitability of a future mine, the
potential value is further compounded by the circa 30% rise in
copper price since the maiden resource was announced last
September. With the current copper price now approaching the
US$3/lb used for the upside case in the original T3 Scoping Study
we released on 6 December 2016. the team will be looking to
optimise the planned mining schedule and processing rates to
maximise the future economics in the upcoming Prefeasibility
Study."
For further details of the exploration procedures employed
during the Resource Estimation programme including a completed JORC
2012 Table 1, a drill plan and drill collar table we would refer
readers to the announcement released today by MOD Resources.
This announcement can be viewed through the following link:
http://search.asx.com.au/s/search.html?query=mod&collection=asx-meta&profile=web
Shareholders should note that the timing of MOD announcements
are outside the control of MTR, however MTR does its utmost to
announce the drill results and important updates as soon as
practicable after MOD makes its announcement to the ASX. MTR are
only made aware of drill results and important updates immediately
prior to the MOD release.
T3 Revised Mineral Resource Estimate
The JORC compliant Mineral Resource Estimate outlined in this
release constitutes the first revision to a maiden Mineral Resource
Estimate for the T3 Deposit which was announced on 26 September
2016. This revised Mineral Resource Estimate may require further
revision and resource modelling before it progresses towards an Ore
Reserve which is a key outcome of the planned Prefeasibility
Study.
Table 1 below includes the revised Mineral Resource Estimates at
Cu cut-off grades of 0.5%, 1% & 1.5% Cu.
Table 1: T3 Revised Mineral Resource Estimate
Gross (100% basis) Net Attributable (MTR 30%) Operator
JORC Category Cut-off Cu% Tonnes (million) Grade Contained Tonnes (million) Grade Contained
Cu% Ag g/t Cu (Kt) Ag (Moz) Cu% Ag g/t Cu (Kt) Ag (Moz)
Measured 0.5 8.954 1.27 12.50 113.45 3.60 2.686 1.27 12.50 34.04 1.08 MOD
1.0 6.548 1.45 13.58 94.62 2.86 1.964 1.45 13.58 28.39 0.86 MOD
1.5 2.179 1.90 17.91 41.49 1.25 0.654 1.90 17.91 12.45 0.38 MOD
Indicated 0.5 11.202 1.19 12.50 133.43 4.50 3.361 1.19 12.50 40.03 1.35 MOD
1.0 7.240 1.42 14.07 102.52 3.28 2.172 1.42 14.07 30.76 0.98 MOD
1.5 2.200 1.89 18.07 41.62 1.28 0.660 1.89 18.07 12.49 0.38 MOD
Inferred 0.5 15.810 1.03 13.09 162.04 6.65 4.743 1.03 13.09 48.61 2.00 MOD
1.0 6.786 1.42 16.59 96.09 3.62 2.036 1.42 16.59 28.83 1.09 MOD
1.5 2.108 1.91 20.66 40.16 1.40 0.632 1.91 20.66 12.05 0.42 MOD
TOTAL 0.5 35.966 1.14 12.79 408.93 14.79 10.790 1.14 12.79 122.68 4.44 MOD
1.0 20.574 1.43 14.73 293.18 9.74 6.172 1.43 14.73 87.95 2.92 MOD
1.5 6.487 1.90 18.84 123.25 3.93 1.946 1.90 18.84 36.98 1.18 MOD
Source: Mr A.I. Pretorius, MSc. Pri.Sci.Nat (Competent
Person)
Note: rounding errors may be present
In addition to the revised Mineral Resource Estimate in Table 1,
an additional, largely Inferred, low-grade Resource has been
estimated using a cut-off of 0.25% Cu. Depending on the outcome of
a future Ore Reserve Estimate (to be undertaken as part of the
Prefeasibility Study), some of this low-grade Resource may be
economic to process in which case it would be stockpiled separately
for use as low-grade feedstock during or at the end of any future
mining of T3.
Table 2: T3 Revised Mineral Resource Estimate - Low-Grade (0.25%
Cu Cut-off)
Gross Net Attributable (MTR 30%) Operator
JORC Cut-off Tonnes Grade Contained Tonnes Grade Contained
Category (million) (million)
Cu% Cu% Ag g/t Cu (Kt) Ag (Moz) Cu% Ag g/t Cu (Kt) Ag (Moz)
Measured 0.25 1.340 0.34 5.52 4.57 0.24 0.402 0.34 5.52 1.37 0.07 MOD
Indicated 0.25 2.964 0.33 4.54 9.90 0.43 0.889 0.33 4.54 2.97 0.13 MOD
Inferred 0.25 9.825 0.34 4.99 33.21 1.58 2.947 0.34 4.99 9.96 0.47 MOD
TOTAL 0.25 14.129 0.34 4.95 47.61 2.25 4.239 0.34 4.95 14.28 0.68 MOD
Source: Mr A.I. Pretorius, MSc. Pri.Sci.Nat (Competent
Person)
Note: rounding errors may be present
T3 - MINERAL RESOURCE STATEMENT
1. Geology and Geological Interpretation
The copper and silver mineralisation which is the basis for the
T3 Phase One Mineral Resource is interpreted to be a Proterozoic or
early Palaeozoic age, vein related sediment hosted deposit which is
different to other known deposits and mines in the central Kalahari
Copper Belt in Botswana.
The Mineral Resource has been defined along >1km long strike
length and the copper and silver sulphide mineralisation occurs in
veins and disseminations within host rocks that include mudstone,
siltstone, sandstone and marl units considered part of the D'Kar
Formation. Footwall to the copper/silver Resource is generally
defined by low-grade disseminated lead and zinc mineralisation
within sediments also considered part of the D'Kar Formation.
Mineralisation is very continuous and is dominated by mainly
chalcopyrite with chalcocite and bornite copper sulphides occurring
in lesser amounts. Mineralisation extends from shallow depth (35m
depth) to the limit of drilling to date at 480m vertical depth.
Minor malachite and chrysocolla oxide mineralisation occurs near
surface between approximately 25-50m depth.
The T3 mineralisation type can be described as a sheeted vein
deposit dipping at 20-30 degrees to the north with varying widths
of disseminated mineralisation around the veins. The deposit may
represent multiple stacked, mineralised veins and units, thrusted
one upon the other.
This interpretation opens up potential for resource extensions
along strike east and west, as well as at depth and down dip. This
potential is being tested in the current drilling programme.
2. Drilling Technique
The drilling results referred to in this release were drilled by
diamond core drilling rigs. HQ3 diameter drill core was drilled for
the shallow drill holes and geotechnical holes and NQ for the
deeper drill holes. Triple tube drilling was used for the shallow
drill holes to maximise core recovery in oxidised sediments
intersected at shallow depth.
3. Sampling, Sub Sampling and Analytical Techniques
Drill core was logged, split by diamond saw and sampled on site.
Samples of drill core were taken from half core and sampled at 1m
lengths or less as dictated by lithological contacts, and assayed
for Cu, Ag, Pb, Zn, Mo, ASCu (acid soluble copper) and S at ALS
laboratories in Johannesburg. Samples of HQ3 core were taken from
quarter core samples and sent for analysis.
Standards, blanks and duplicates were inserted into the sample
stream. The remaining half portion of drill core was retained on
site at Tshukudu's core logging facility in Ghanzi, Botswana.
Samples arriving at the laboratory were crushed using a jaw
crusher to a particle size less than 15 mm and then crushed to a
fineness of 80% less than 2.0mm. The split for analysis was milled
to achieve a fineness of 90%less than 106 µm.
Analytical techniques were chosen to best characterise total and
non-sulphide copper and silver mineralisation. Analysis for acid
soluble Copper was by method CuAA05 and determined by sulphuric
acid leach followed by ICP-OES (Inductively Coupled Plasma -
Optical Emission Spectrometry) finish. Analysis for total Copper,
Silver, Lead, Zinc and Molybdenum is determined by 4 acid digest
followed by ICP-OES finish. Total Sulphur is analysed by S-IR08
method.
4. Resource criteria and assumptions
The resource estimate was classified in accordance with the
Australasian Code for Reporting of Exploration results, Mineral
Resources and Ore Reserves (JORC Code, 2012).
Geological interpretation was based on drill hole lithology and
grade data which was completed on 22 cross-sections using Datamine
software. 3D (wireframe) geological modelling was carried out by
Sphynx Consulting CC ('Sphynx') and reviewed by MOD Resources.
Sphynx produced resource tables at a copper cut-off grade of 0.5%
Cu (Table 1).
The Mineral Resource estimate was based on the following factors
and assumptions:
-- A review of the QAQC data was completed and considered satisfactory
for Measured Indicated and Inferred Category Resources.
-- Mineralisation was defined by zones identified from downhole
lithological and analytical data.
-- Grade domaining was applied by constructing hard boundaries at 0.25%
Cu and 0.5% Cu respectively.
-- Using parameters derived from modelled variograms, Ordinary Kriging
(OK) was used to estimate average block grades for Cu, Ag, Pb,
Zn,
ASCu, S and Mo.
-- The block size is 5 m (X) by 5 m (Y) by 2.5 m (Z) in the x (east) and
y (north) directions.
-- The following table summarises the Search ellipsoid parameters:
Search Search Search Angle Angle Angle 3 Axis 1 Axis 2 Axis 3
X Y Z 1 2
200m 100m 2m 60 20 0 3 2 1
Min Max Factor Min Max Factor Min Max
Samples Samples Samples Samples Samples Samples
5 30 2 5 30 4 5 30
-- The estimation was conducted in three passes with the search radius
increasing for each pass.
-- The model was validated visually and statistically using comparison to
sample statistics.
-- Bulk densities were assigned to mineralised domains. The dry bulk
densities were based on immersion measurements from 1,624
core
samples. A median bulk density of 2.75 t/m3 was used.
-- The relative accuracy is reflected in the resource classification that
is in line with industry acceptable standards. It is a revised
global
resource estimate with no production data.
-- This Resource is a revised resource estimate compared with the maiden
Mineral Resource Estimate announced 26 September 2016.
5. Mineral Resource Estimate Competent Persons
The information in this announcement that relates to Mineral
Resource estimation and classification of the T3 Copper/Silver
Project was conducted and approved by Mr A.I. Pretorius, MSc.
Pri.Sci.Nat. Mr Pretorius is an independent consultant to MOD
Resources Ltd and a member of the South African Council for
Scientific Professionals (SACNASP Membership Number 400060/91). Mr
Pretorius has sufficient experience that is relevant to the style
of mineralisation and type of deposit under consideration and to
the activity being undertaken to qualify as a Competent Person as
defined in the 2012 Edition of the 'Australasian Code for Reporting
of Exploration Results, Mineral Resources and Ore Reserves'.
The information in this announcement that relates to Geological
Data and Exploration Results at the Botswana Copper/Silver Project,
which includes T3 is reviewed and approved by Jacques Janse van
Rensburg, BSc (Hons), Business Development Manager for MOD
Resources Ltd. He is registered as a Professional Natural Scientist
with the South African Council for Natural Scientific Professions
(SACNASP) No. 400101/05 and has reviewed the technical information
in this report. Mr Janse van Rensburg has sufficient experience,
which is relevant to the style of mineralisation and type of
deposit under consideration and the activity, which it is
undertaking to qualify as a Competent Person as defined in the 2012
Edition of the Australasian Code for Reporting Exploration Results,
Mineral Resources and Ore Reserves.
Background
The T3 Project is located on the Kalahari Copper Belt in
northern Botswana and is part of the MOD/MTR joint venture Botswana
Copper/Silver Project. T3 is located within the central part of the
T3 Dome (approximately 1000km2), which is the focus of rapidly
increasing exploration activity undertaken by Tshukudu. Two
significant resources have been discovered to date within the T3
Dome: T1 (Mahumo deposit 100% MOD) and T3 (70% MOD / 30% MTR).
The T3 deposit was discovered in March 2016 when a reverse
circulation ("RC") drill hole intersected 52m @ 2.0% Cu and 32g/t
Ag from shallow depth. The maiden T3 JORC compliant Mineral
Resource was announced on 26 September 2016. The results of a
Scoping Study for an open pit mine at T3 with a 2Mtpa processing
plant, an indicative mine life of 10 years and an average
production rate of 21,800tpa of copper and 665,000oz pa of silver
was released on 6 December 2016. Work on a Pre-Feasibility Study
(PFS) commenced in January 2017 and additional deeper copper
mineralisation was discovered below the T3 Resource in February
2017.
The T3 Prospect geological data and exploration results have
been reviewed and approved by Jacques Janse van Rensburg, BSc
(Hons), Business Development Manager and Competent Person for MOD
Resources Ltd. Mineral Resource estimation and classification of
the T3 Copper/Silver Project was conducted and approved by Mr A.I.
Pretorius, MSc. Pri.Sci.Nat. an independent consultant to MOD
Resources Ltd.
The technical information contained in this disclosure has been
read and approved by Mr Nick O'Reilly (MSc, DIC, MAusIMM, FGS), who
is a qualified geologist who acts as the Competent Person under the
AIM Rules - Note for Mining and Oil & Gas Companies. Mr
O'Reilly has visited the T3 site and reviewed MOD's drilling and
sampling protocols and procedures. Mr O'Reilly is a Principal
consultant working for Mining Analyst Consulting Ltd which has been
retained by Metal Tiger PLC to provide technical support.
For further information on the Company, visit:
www.metaltigerplc.com:
Michael McNeilly Tel: +44(0)20 7099 0738
(Chief
Executive Officer)
Keith Springall Tel: +44 (0)20 7099 0738
(Finance
Director
&
Company Secretary)
Stephen Allen or RFC Ambrian Ltd Tel: +44 (0) 3440 6800
Bhavesh Patel (Nominated Adviser)
Jonathan Williams RFC Ambrian Ltd Tel: +44 (0)20 3440 6800
(Joint Broker)
Nick Emerson SI Capital Tel: +44 (0)1483 413 500
(Joint Broker)
Andrew Monk VSA Capital Limited Tel: +44 (0)20 3005 5000
Andrew Raca (Joint Broker)
Gordon Poole Camarco Tel: +44 (0)20 3757 4980
James Crothers (Financial PR)
Notes to Editors:
Metal Tiger plc is listed on the London Stock Exchange AIM
Market ("AIM") with the trading code MTR and invests in high
potential mineral projects with a precious and strategic metals
focus.
The Company's target is to deliver a very high return for
shareholders by investing in significantly undervalued and/or high
potential opportunities in the mineral exploration and development
sector timed to coincide, where possible, with a cyclical recovery
in the exploration and mining markets. The Company's key strategic
objective is to ensure the distribution to shareholders of major
returns achieved from disposals.
Metal Tiger's Metal Projects Division is focused on the
development of its key project interests in Botswana, Spain and
Thailand. In Botswana Metal Tiger has a growing interest in the
large and highly prospective Kalahari copper/silver belt. In Spain
Metal Tiger the Company has tungsten and gold interests in the
highly-mineralised Extremadura region. In Thailand Metal Tiger has
interests in two potentially near-production stage silver/lead/zinc
mines as well as licences, applications and critical historical
data covering antimony, copper, gold, silver, lead and zinc
opportunities.
The Company has access to a diverse pipeline of new
opportunities focused on the natural resource sector including
physical resource projects, new natural resource centred
technologies and resource sector related fintech opportunities.
Pipeline projects deemed commercially viable may be undertaken by
Metal Tiger or by an AIM or NEX Exchange (formerly ISDX) partner
with whom the Company is engaged.
Glossary of Technical Terms
"cut-off" the grade threshold above which a mineral material is considered potentially economic
"g/t" grams per tonne; equivalent to parts per million ('ppm').
"Mineral Resource" A 'Mineral Resource' is a concentration or occurrence of solid material of economic interest in or on the Earth's crust in such form, grade (or quality),
and quantity that there are reasonable prospects for eventual economic extraction. The location, quantity, grade (or quality), continuity and
other geological characteristics of a Mineral Resource are known, estimated or interpreted from specific geological evidence and knowledge, including
sampling. Mineral Resources are sub-divided, in order of increasing geological confidence, into Inferred, Indicated and Measured categories.
"Inferred Resource" An 'Inferred Mineral Resource' is that part of a Mineral Resource for which quantity and grade (or quality) are estimated
on the basis of limited geological evidence and sampling. Geological evidence is sufficient to imply but not
verify geological and grade (or quality) continuity. It is based on exploration, sampling and testing information
gathered through appropriate techniques from locations such as outcrops, trenches, pits, workings and drill holes.
"Indicated Resource" An 'Indicated Mineral Resource' is that part of a Mineral Resource for which quantity, grade es are gathered.
(or quality), densities, shape and physical characteristics are estimated with sufficient
confidence to allow the application of Modifying Factors in sufficient detail to
support mine planning and evaluation of the economic viability of the deposit.
Geological evidence is derived from adequately detailed and reliable exploration, sampling
and testing gathered through appropriate techniques from locations such as outcrops,
trenches, pits, workings and drill holes, and is sufficient to assume geological and
grade (or quality) continuity between points of observation where data and sampl
"Measured Resource" A 'Measured Mineral Resource' is that part of a Mineral Resource for which quantity, grade ed.
(or quality), densities, shape, and physical characteristics are estimated with confidence
sufficient to allow the application of Modifying Factors to support detailed mine
planning and final evaluation of the economic viability of the deposit. Geological
evidence is derived from detailed and reliable exploration, sampling and testing gathered
through appropriate techniques from locations such as outcrops, trenches, pits,
workings and drill holes, and is sufficient to confirm geological and grade (or quality)
continuity between points of observation where data and samples are gather
"Ore Reserve" An 'Ore Reserve' is the economically mineable part of a Measured and/or Indicated Mineral Resource. It includes
diluting materials and allowances for losses, which may occur when the material is mined or extracted and is
defined by studies at Pre-Feasibility or Feasibility level as appropriate that include application of Modifying
Factors. Such studies demonstrate that, at the time of reporting, extraction could reasonably be justified.
"JORC Code (2012)" The 2012 Edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves which sets out minimum standards,
recommendations and guidelines for Public Reporting in Australasia of Exploration Results, Mineral Resources and Ore Reserves. It has been
adopted by The Australasian Institute of Mining and Metallurgy (the "AusIMM") and the Australian Institute of Geoscientists ("AIG"). The JORC
Code (2012) is an internationally recognised reporting code as defined by the Combined Reserves International Reporting Standards Committee.
"variogram" A geostatistical tool that describes the spatial continuity of the data
"Kriging" an interpolation method for assigning values from samples to ore blocks that minimises the estimation error.
"chrysocolla" A hydrated copper silicate mineral of secondary origin and usually forming in the oxidation zones of copper ore bodies
"malachite" An intense green copper carbonate mineral generally forming in the upper, oxidised parts of copper deposits
"bornite" Bornite, also known as peacock ore, is a copper sulphide mineral with the formula Cu5FeS4.
"chalcocite" Chalcocite is a copper sulphide mineral with the formula Cu2S, and is an important
copper ore mineral. It is opaque and dark-grey to black with a metallic luster.
"chalcopyrite" Chalcopyrite is a copper sulphide mineral with formula CuFeS2. It has a brassy to golden yellow colour.
"veins" A vein is a sheet-like or anastomosing fracture that has been infilled with mineral
ore (e.g. chalcopyrite) or mineral gangue (quartz, calcite etc) material, within
a rock. Veins form when minerals carried by an aqueous solution within the rock mass
are deposited through precipitation and infill or coat the fracture faces.
"sheeted veins" A group of closely spaced, distinct parallel fractures filled with mineral matter and separated by layers of barren rock
"disseminated" A geology term denoting a deposit in which (usually) fine-grained ore minerals are scattered throughout the rock
"diamond drilling" A drilling method in which penetration is achieved through abrasive cutting by rotation
of a diamond encrusted drill bit. This drilling method enables collection of tubes
of intact rock (core) and when successful gives the best possible quality samples
for description, sampling and analysis of an ore body or mineralised structure.
"grade" The proportion of a mineral within a rock or other material. For copper mineralisation this is usually reported as % of copper per tonne of rock (g/t)
"assay" The laboratory test conducted to determine the proportion of a mineral within a rock or other material. For copper,
usually reported as percentage which is equivalent to percentage of the mineral (i.e. copper) per tonne of rock
"dip" A line directed down the steepest axis of a planar structure including a planar ore body or
zone of mineralisation. The dip has a measurable direction and inclination from horizontal
"intercept/intersection" Refers to a sample or sequence of samples taken across the entire width or an ore body or mineralized
zone. The intercept is described by the entire thickness and the average grade of mineralisation
"lbs" Pounds (measure of weight)
"Cu" The chemical symbol for copper
"Au" The chemical symbol for gold
"Ag" The chemical symbol for silver
"Pb" The chemical symbol for lead
"Zn" The chemical symbol for zinc
"Mo" The chemical symbol for molybdenum
"ASCu" That copper contained in a deposit that is able to be leached by acid (generally sulphuric acid)
"QAQC" Quality assurance/quality control which ranges from sample handling at all levels of exploration and processing
as well as defined protocols for insertion of standards/blanks and duplicates in assaying.
"Standards" Standards or samples purchased from labs, which have a known grade of mineral to be tested for. They can be high, low
or even median grade standards. The purpose of the standards are to test for calibration errors at the lab level.
"Blanks" Material which is guaranteed not to contain any of the mineral being assayed for. This
will determine if potential contamination at the lab setting is taking place.
"Duplicates" Duplicates are taken in two different phases. Core duplicates are a secondary splitting of core resulting in two samples that in theory should be similar
in grade. The second, usually done as internal tests in the lab, is to retest a sample already tested. The samples should in theory be similar.
View source version on businesswire.com:
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