Announces Geotechnical LAB Results FOR the Preliminary Economic Assessment of Its Xaudum Iron Project IN Botswana
TSODILO RESOURCES LIMITED
ANNOUNCES GEOTECHNICAL LAB RESULTS FOR THE
PRELIMINARY ECONOMIC ASSESSMENT OF ITS XAUDUM IRON
PROJECT IN BOTSWANA
FOR IMMEDIATE RELEASE September 20, 2021
TORONTO, ONTARIO - Tsodilo Resources Limited ("Tsodilo" or the "Company") (TSX-
V: TSD) (OTCQB: TSDRF) (FSE: TZO) is pleased to announce positive geotechnical lab test
results for its wholly owned Xaudum Iron Project. These are the first set of geotechnical lab
tests conducted on the Xaudum Iron Formation (XIF) and indicate that the XIF materials are
competent and have good to moderate strength properties and will result in a positive set of
geotechnical parameters to be used in the ongoing Preliminary Economic Assessment (“PEA”)
of the XIF project.
Rock strength data is important in generating slope designs for safe mining and this set of lab
test data will contribute to further geotechnical studies into rock mass rating for pit stability
and pit wall design during the engineering stage of the PEA. The aim of conducting lab tests
on these XIF samples is to measure the ranges at which the XIF will fail under tension,
compression and shear on their discontinuities. To test the above-mentioned strength
properties, the selected samples from XIF Geodomains were subjected to the following tests:
Unconfined Compressive Strength, Brazilian Tensile Strength, and Direct Shear Strength.
These tests were conducted at the Botswana International University of Science and
Technology (BIUST) by the Mining and Geological Engineering department and the results
can be found in Table 1 (http://www.tsodiloresources.com/i/pdf/2021-09-17-Table-1.pdf).
Tsodilo's Chairman and CEO, James M. Bruchs, commented “The results were what we
expected, they show that the XIF materials are all within standard mechanical rock property
ranges and that there will be no geotechnical issues arising from the XIF materials and confirm
that the XIF will show “normal” pit wall angles as assumed in the Company’s previous resource
reporting.”
31 geotechnical tests were processed by BIUST, see Table 1. A summary of the completed
geotechnical test works is set forth below:
18 Unconfined Compressive Strength (UCS) tests gave the following results:
Fresh Banded Magnetite formation (MBA) has a Very Strong Rock Strength
Classification with a UCS average value of 132.7 MPa. Cataclastic mode of failure is
the most prevalent in these MBA samples where the samples break irregularly at high
stress without following any plane of weakness;
o Cataclastic is common in hard and brittle rocks, this mode of failure suggests
that MBA banding is not necessarily a plane of weakness;
Weathered Banded Magnetite (MBW) has a Strong Rock Strength Classification with
a UCS average value of 81.3 MPa ;
o MBW tends to break along foliation suggesting that there are micro-fractures
developed along foliation caused by weathering;
Diamictite Schist Formation (DIA) has a Strong Rock Strength Classification with a
UCS average value of 57.2 MPa. DIA is predominantly the main country rock in the
XIF and will make up the bulk of the pit wall materials during mining of the XIF;
o This Geodomain exhibits single shear as the dominant mode of failure which
can be attributed to foliation and schistocity of this rock type that creates a plane
of weakness;
Diamictite Schist Weathered formation (DIAW) has a Medium Strong Rock Strength
Classification with a UCS average value of 31.6 MPa;
o DIAW breaks easier along the schistocity foliation suggesting the weathering
exacerbates the schistocity weakness planes of the rock mass;
Calcrete Overburden (CAC) has a Strong Rock Strength Classification with a UCS
average value of 80.4 MPa;
o Axial splitting is the dominant mode of fracture for this rock type.
Table 1: Part A shows the UCS test results
8 Brazilian Tensile Strength (BTS) tests gave the following results:
MBA gave a Strong to Very Strong tensile strength with an average of 9.65 MPa;
DIA gave a Medium Strong to Strong tensile strength with an average of 8.82 MPa;
Table 1: Part B shows the BTS test results
The BTS values for DIA and MBA were plotted against UCS results and compared
with other rock strength values in the literature showing the strong nature of these
materials, see Figure 1.
4 Direct Shear Strength (DSS) tests on open discontinuities (joints) on DIA Geodomain
gave the following results:
These joints gave effective friction angles ranges from 19.29o (Poor) to 36.87o (Good)
and the effective cohesion of the joint surface ranged from 27.02 kPa to 273.81 kPa;
o The cohesion values are considered to be moderate low to moderate when
compared to other geological scenarios in the literature, see Figure 2;
The friction angle ranges show that the material along the joint surface has variable
amounts of “weak” phyllosilicate materials (dominated by biotite) due to the schistic
nature of the DIA; and
o Group A (Figure 2) showing appreciable phyllosilicate (biotite) material and
thus lower effective friction angles, compared to Group B (Figure 2);
These results of these DSS tests are well within normal results for materials like the
DIA.
Table 1: Part C shows the DSS test results
Geotechnical Lab Test Conclusions
The UCS and the BTS strength tests indicate that the XIF major Geodomains are competent
and strong in both dimensions of compression and tension. The UCS mode of failure indicates
that DIA, DIAW and MBW tend to show a preferred mode of failure related to the foliation.
This is not as common for MBA and CAC. The joint discontinuities tested for DSS lean
towards poor and fair characterizations.
These are the first set of geotechnical lab tests conducted on the XIF and show that the XIF
materials are competent and will result in a good set of geotechnical parameters to be used in
the ongoing PEA. These geotechnical lab tests show that the XIF materials are all within
standard mechanical rock property ranges and that there will be no geotechnical issues arising
from the XIF materials confirming that the XIF will show “normal” pit wall angles as assumed
and presented in the Company’s XIF resources report (see Press Release of 9/14/2014 on the
Company’s website for further details).
References
Chakraborty, S., Bisai, R., Palaniappan, S. K., & Pal, S. K. (2019). Failure Modes of
Rocks under Uniaxial Compression Tests: An Experimental Approach. Journal of
Advances in Geotechnical Engineering Volume 2 Issue 3, 1-8.
Perras, M. A., & Diederichs, M. S. (2014). A Review of the Tensile Strength of Rock:
Concepts and Testing. Springer.
Read, J., & Stacey, P. (2010). Guidelines for Open Put Slope Design . Collingwood:
CSIRO Publishing.
Wyllie, D. C., & Norrish, N. I. (2006). Rock Strength Properties and their
Measurements. 372-390. Chapter 14 from Landslides: Investigations and Mitigations
by Turner, K. A. and Schuster, R. L. (ISBN: 030906208X)
About Botswana International University of Science and Technology
The Botswana International University of Science and Technology is a Government of
Botswana supported institution established as a research-intensive University that specializes
in Engineering, Science and Technology at both undergraduate and graduate (Master’s and
Doctoral) levels. It aims to increase competitiveness, economic growth and sustainable
development; address the shortage of skilled scientists and technologists; increase movement
of skilled people across national boundaries; stimulate research, innovation, and technology
transfer; improve society’s aspirations to improve health, wealth and well-being; address
increased demand for access to tertiary education; and enable a more competitive and
innovative tertiary education sector.
The University is a national strategic initiative that is intended to serve as one of the key
platforms for transforming Botswana’s economy. Because of its research emphasis, BIUST
works with the private sector to meet emerging skills needs of the industry, as well as identifies
challenges that can be solved through applied research. (www.biust.ac.bw).
About the XIF Project
◊ The project is located in the North-West District of Botswana and is proximate to the
Namibian boarder and lies twenty-two (22) miles from the town of Divundu in
Namibia. The Walvis Bay-Ndola-Lubumbashi Development Corridor (previously
known as the Trans-Caprivi), line linking Zambia and Namibia is planned to pass
through Divundu providing access to Walvis Bay, Namibia’s deep-sea port.
The Company has joined the Walvis Bay Corridor Group (WBCG). Currently
the portion of the corridor between Grootfontein (Namibia) to Katima Mulilo
located on the Zambia border is the portion of the corridor closest to the
Xaudum Iron Project. In March 2021, the Namibian Ministry of Works and
Transport commissioned a Feasibility Study for the Trans-Zambezi Railway
Extension Grootfontein -- Rundu - Katima Mulilo. The proposed rail extension
between Grootfontein and Katima Mulilo is significant to Tsodilo as the
extension is planned to pass through Divundu. The feasibility study is expected
to be completed by the end of 2021 and its results will be considered in our
Preliminary Economic Assessment (PEA).
The project is also located within forty-three (43) miles of the proposed
Mucusso line to Angola’s Namibe Port.
◊ Preliminary work on the Xaudum Iron project has defined a CIM compliant Inferred
Mineral Resource Estimate of 441 million tonnes (Mt) with an average grade of 29.4%
Fe, 41.0% SiO2, 6.1% Al2O3 and 0.3% P for the Block 1 magnetite XIF.
◊ Block 1 is a fraction of the potential XIF magnetite resource. An extrapolated
exploration target has defined the XIF to be in the order of 5 to 7 billion tonnes at 15 -
40% Fe. This exploration target was generated by inversion modelling of ground
magnetic geophysical data which was compared and moderated to volumes from
drilling data within Block 1 and its potential quantity and grade is conceptual in nature.
To date, there has been insufficient exploration to define a mineral resource other than
in Block 1 and it is uncertain if further exploration will result in the target being
delineated as a mineral resource. See Press Release of 9/14/2014 on the Company’s
website for further details.
◊ Metallurgical magnetic separation results (Davis Tube Recovery) show an average
concentrate of 67.2% Fe, 4.2% SiO2, 0.5% Al2O3, 0.07% P is obtained at P80 grind
size of 80 microns, although higher grades are possible at finer P80’s. See Press
Release of 12/17/2013 on the Company’s website.
◊ Further exploration will be focused on Block 2a where the Company expects an
increase in the resource.
An informational presentation of the project outlining more information can be found on the
Company’s website at http://www.tsodiloresources.com/i/pdf/Tsodilo-Iron-Project-
Overview_May-2021_Website.pdf.
More technical information a report prepared by SRK Consulting (UK) Ltd. for Gcwihaba
Resources (Pty) Ltd. titled “Mineral Resource Estimate for the Xaudum Iron Project (Block 1),
Republic of Botswana” with an effective date of August 29, 2014 and filed on SEDAR under
the Company’s profile at www.sedar.com.
About Tsodilo Resources Limited
Tsodilo Resources Limited is an international diamond and metals exploration company
engaged in the search for economic diamond, metal deposits and industrial stone at its Bosoto
(Pty) Limited ("Bosoto"), Gcwihaba Resources (Pty) Limited ("Gcwihaba") and Newdico (Pty)
Ltd. ("Newdico) projects in Botswana and its Idada 361 (Pty) Limited ("Idada") project in
Barberton, South Africa. The Company has a 100% stake in Bosoto (Pty) Ltd. which holds the
BK16 kimberlite project in the Orapa Kimberlite Field (OKF) in Botswana and the PL216/2017
diamond prospection license also in the OKF. The Company has a 100% stake in its Gcwihaba
project area consisting of seven metal (base, precious, platinum group, and rare earth)
prospecting licenses all located in the North-West district of Botswana. The Company has a
100% interest in its Newdico industrial stone project located in Botswana’s Central District.
Additionally, Tsodilo has a 70% stake in Idada Trading 361 (Pty) Limited which holds the gold
and silver exploration license in the Barberton area of South Africa. Tsodilo manages the
exploration of the Newdico, Gcwihaba, Bosoto and Idada projects. Overall supervision of the
Company's exploration program is the responsibility of Dr. Alistair Jeffcoate, Project Manager
and Chief Geologist of the Company and a "qualified person" as such term is defined in
National Instrument 43-101.
This press release may contain forward-looking statements. All statements, other than
statements of historical fact, that address activities, events or developments that the Company
believes, expects or anticipates will or may occur in the future (including, without limitation,
statements pertaining to the use of proceeds, the impact of strategic partnerships and
statements that describe the Company's future plans, objectives or goals) are forward-looking
statements. These forward-looking statements reflect the current expectations or beliefs of the
Company based on information currently available to the Company. Forward-looking
statements are subject to a number of risks and uncertainties that may cause the actual results
of the Company to differ materially from those discussed in the forward- looking statements,
and even if such actual results are realized or substantially realized, there can be no assurance
that they will have the expected consequences to, or effects on the Company. Factors that could
cause actual results or events to differ materially from current expectations include, among
other things, changes in equity markets, changes in general economic conditions, market
volatility, political developments in Botswana and surrounding countries, changes to
regulations affecting the Company's activities, uncertainties relating to the availability and
costs of financing needed in the future, exploration and development risks, the uncertainties
involved in interpreting exploration results and the other risks involved in the mineral
exploration business. Any forward-looking statement speaks only as of the date on which it is
made and, except as may be required by applicable securities laws, the Company disclaims
any intent or obligation to update any forward-looking statement, whether as a result of new
information, future events or results or otherwise. Although the Company believes that the
assumptions inherent in the forward-looking statements are reasonable, forward-looking
statements are not a guarantee of future performance and accordingly undue reliance should
not be put on such statements due to the inherent uncertainty therein.
Forward-looking statements are subject to a number of risks and uncertainties that may cause
the actual results of the Company to differ materially from those discussed in the forward-
looking statements and, even if such actual results are realized or substantially realized, there
can be no assurance that they will have the expected consequences to, or effects on, the
Company. Factors that could cause actual results or events to differ materially from current
expectations include, among other things, uncertainties relating to availability and cost of
funds, timing and content of work programs, results of exploration activities, interpretation of
drilling results and other geological data, risks relating to variations in the diamond grade
and kimberlite lithologies; variations in rates of recovery and breakage; estimates of grade
and quality of diamonds, variations in diamond valuations and future diamond prices; the state
of world diamond markets, reliability of mineral property titles, changes to regulations
affecting the Company's activities, delays in obtaining or failure to obtain required project
approvals, operational and infrastructure risk and other risks involved in the diamond
exploration and development business. Any forward-looking statement speaks only as of the
date on which it is made and, except as may be required by applicable securities laws, the
Company disclaims any intent or obligation to update any forward-looking statement, whether
as a result of new information, future events or results or otherwise. Although the Company
believes that the assumptions inherent in the forward-looking statements are reasonable,
forward-looking statements are not a guarantee of future performance and accordingly undue
reliance should not be put on such statements due to their inherent uncertainty.
Neither the TSX Venture Exchange ("TSXV") nor its Regulation Services Provider (as that term
is defined in the policies of the TSXV) accepts responsibility for the adequacy or accuracy of
this news release. This news release may contain assumptions, estimates, and other forward-
looking statements regarding future events. Such forward-looking statements involve inherent
risks and uncertainties and are subject to factors, many of which are beyond the Company's
control, which may cause actual results or performance to differ materially from those
currently anticipated in such statements.
FOR FURTHER INFORMATION PLEASE CONTACT:
James M. Bruchs Chairman and Chief Executive Officer [email protected]
Dr. Alistair Jeffcoate Project Manager and Chief Geologist [email protected]
Head Office Telephone +1 416 572 2033 Facsimile + 1 416 987 4369
Website http://www.TsodiloResources.com