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ZENITH MINERALS LIMITED — Management Reports 2013
Apr 3, 2013
66123_rns_2013-04-03_08cda24c-17f8-4c8f-bfcc-6fe0709fa685.pdf
Management Reports
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MOUNT ALEXANDER RESOURCE DRILLING UPDATE
Mount Alexander Magnetite Project (ZNC 100%)
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RC drilling programme results confirm southeast BIF resource target
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New results include:
Activities
Exploration/Development Mt Alexander Magnetite Iron Earaheedy Manganese
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119 metres @ 28.3% Fe from 23m in ZMARC028, and
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95 metres @ 30.5% Fe from 1m in ZMARC029
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DTR results indicate that it is possible to produce a magnetite concentrate containing 70% iron with <3% silica and low phosphorous.
Details as at December 2012
Issued Shares 95.0 m Unlisted options 1.3 m Mkt. Cap. ($0.15) A$ 14.25m Cash Dec. 2012 A$ 2.56m Debt Nil
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New drilling results are outside current (Inferred) Resource of 392.9 Million tonnes @ 29.5% Fe within overall exploration target[*] of 0.75 to 1.4 Billion tonnes
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New global resource estimate study has commenced.
Directors
Gary Comb Chairman Neil Martin Managing Director Stan Macdonald Non Exec Director Mike Joyce Non Exec Director
Major Shareholders
HSBC Custod. Nom. 13.6 % Giralia (Atlas Iron) 10.8% Tilbrook/Grey Willow 3.9% Nada Granich 3.7% Yandal Inv. PL 3.4%
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Figure 1. Mount Alexander Project location showing proximity to coast and regional infrastructure
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Mt Alexander Iron (Zenith Minerals 100%)
Assay results have been received for RC drilling at the Company’s 100% owned Mount Alexander magnetite iron ore project in the West Pilbara. The recent drilling programme successfully tested the south eastern portion of the Mt Alexander deposit, with eight (8) holes (ZMARC027-034) covering almost 2 kilometres of strike. Results include:
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119 metres @ 28.3% Fe from 23m in ZMARC028, and
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95 metres @ 30.5% Fe from 1m in ZMARC029
The Davis Tube Recovery (“DTR”) results from the recent drilling demonstrate that it will be possible to produce a high quality magnetite concentrate of ~70% iron with less than 3% silica and low phosphorous at a nominal p80/40µ grind, which is consistent with results returned from previous test work at Mount Alexander.
The recent drilling confirmed the presence of a continuous steeply north-westerly dipping zone of magnetite mineralisation over a strike extent of more than 1500 metres (Figure 2), of 30m to 110m true thickness (average ~60m), and extending beyond 100m vertical depth (Figures 3 & 4).
Prior to this drilling programme, only about 40% of the Company's Exploration Target had been drill confirmed (Figure 5). The recent programme was aimed at capturing part of the south eastern portion of the Mt Alexander deposit within a JORC resource estimate. The full strike extent of the south-eastern target area has not been fully tested, as a decision was made to withdraw the drilling rig prior to the onset of seasonal wet weather. The extent of outcropping magnetite BIF mineralisation is greater than intersected in drilling, and there remains untested potential for additional mineralisation to the south east (figure 3) as well as along strike.
A new resource estimate study for the project has commenced and is expected to be completed during the June quarter of 2013.
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Figure 2. Mount Alexander Project showing BIF outcrop extent and drill coverage
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BIF
BIF
Figure 3. Mount Alexander Project cross section A-A’
BIF
BIF
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Figure 4. Mount Alexander Project cross section B-B’
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Background on Mount Alexander Magnetite Project
The Mount Alexander magnetite project is only 120 km from the Port of Onslow, and 260 km south west of Karratha in the West Pilbara region of WA (Figure 1). The North West Coastal Highway is 10 km west of the project and the Dampier Bunbury gas pipeline passes to the west of the highway. The project consists of three exploration licenses owned 100% by Zenith Minerals. The Mount Alexander mineralisation occurs in a banded iron formation (BIF) associated with a sequence of amphibolite, dolomite, schist and quartzite of Proterozoic age in the northern Gascoyne Province. These rocks have been metamorphosed to upper greenschist and amphibolite grade.
On 14 April 2011 the Company announced a maiden Inferred Mineral Resource estimate for Mount Alexander which is summarised in the following table:
| Mt Alexander Magnetite Project Mineral Resource estimate(April 2011) | Mt Alexander Magnetite Project Mineral Resource estimate(April 2011) | Mt Alexander Magnetite Project Mineral Resource estimate(April 2011) | Mt Alexander Magnetite Project Mineral Resource estimate(April 2011) | Mt Alexander Magnetite Project Mineral Resource estimate(April 2011) | Mt Alexander Magnetite Project Mineral Resource estimate(April 2011) | Mt Alexander Magnetite Project Mineral Resource estimate(April 2011) | Mt Alexander Magnetite Project Mineral Resource estimate(April 2011) |
|---|---|---|---|---|---|---|---|
| Classification | Tonnes(million) | Fe % | SiO2 % | Al2O3 % | P % | S % | LOI % |
| Inferred | 392.9 | 29.5 | 48.3 | 2.4 | 0.10 | 0.47 | -0.7 |
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Figure 5. Oblique view of Mt Alexander magnetite deposit looking north east of the maiden Inferred Resource volume (yellow) overlain on Exploration Target volume (red. New holes are not shown.
The Inferred Mineral Resource (Figure 5) occupies approximately 40% of the combined Exploration Target for Mount Alexander and Mount Alexander West of 0.75 to 1.43 billion tones, comprising the Exploration Target[] at the Mount Alexander Prospect of 0.6 to 1.2 billion tonnes at between 25% and 35% Fe, and the Exploration Target[] of 150 to 230 million tonnes at 20% to 25% Fe at the Mount Alexander West prospect.
*JORC Statement in relation to the use of the term “Exploration Target” in this document: The potential quantity and grade of this Exploration Target is conceptual in nature. There has been insufficient exploration to define a Mineral Resource and it is uncertain if further exploration will result in the determination of a Mineral Resource.
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Preliminary Davis Tube Recovery (DTR) testwork undertaken on 361 RC samples indicates that the Mount Alexander deposit may be capable of producing high grade magnetite concentrate[#] . The test samples (at P80/40 micron grind) returned an arithmetic mean DTR concentrate grade of 69.9% Fe and 2.5% SiO2, with an arithmetic mean mass recovery of ~30%.
In May 2011 Zenith reported positive results from a Scoping Study on development options for Mount Alexander, based on;
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Concentrator at Mount Alexander; -processing by crushing, grinding, wet magnetic separation;
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Production of 8 mtpa of magnetite concentrate grading >68.6% Fe, at ~30% weight recovery
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Mine life +20 years
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Base Case- Transport of concentrate by slurry pipeline 120km to coast near Onslow,
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Dewatering and storage of the concentrate in a closed shed near Onslow,
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oTransport by barge to an offshore mooring for transfer into ships for export. -
Alternative Transport[**] to APIJV rail head (80 km), then rail to Anketell Port (285 km)
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Third party owned/operated 120Mw power station at/near Onslow, HV power line from Onslow to Mount Alexander and power line to bore field
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Water supply at 7.5 Glpa from bore field (or desalination near Onslow), return water line from port
Work on elements of a feasibility study for the project have been ongoing; aimed at de-risking the project. Zenith’s environmental consultants have finalised Level 1 and Level 2 environmental (flora & flora) surveys which did not identified any major environmental triggers at the site, and work is underway that is aimed at securing access to a project water supply.
Development Partner Selection
Engagement with potential development partners for the large, capital intensive Mount Alexander magnetite project is ongoing. Commercial discussions remain at a non-binding and preliminary stage.
# Samples were submitted to Spectrolabs in Geraldton. Samples were composited from crushed drill sample residues. 150grams of each was control ground to p80 40 microns. A 20 grams sub sample was then used for Davis tube recovery ( Magnetic Field Strength: 3000 Gauss; Washing Time: 20 minutes; Tube Angle: 45 Degrees; Wash Water Flowrate: 540ml/Minute; Tube Oscillation/Stroke: 60 cycles per minute). Resulting concentrate from the Davis Tube was collected and weighed. Non-magnetics were not collected. Size Fractions were determined by hand sieving. Analysis - fusion XRF for Fe, TiO2, Na at 0.01% detection limit, SiO2, Mn, CaO, Al2O3, P, S, As, K2O, Ni, V, Pb, Zn Cu, Cr at 0.001% detection limit. LOI was determined gravimetrically in a muffle furnace at 1000 degrees C. ** This alternative not studied in detail in May 2011 Scoping Study
Zenith Minerals Limited
4[th] April 2013
For further information contact; Neil Martin Managing Director 08 9226 1110
The information in this Report that relates to in-situ Mineral Resources is based on information compiled by Grant Louw of CSA Global. Grant Louw takes overall responsibility for the Mineral Resource Estimate. He is a Member of the Australian Institute of Geoscientists and has sufficient experience, which is relevant to the style of mineralisation and type of deposit under consideration, and to the activity he is undertaking, to qualify as a Competent Person in terms of the ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (JORC Code 2004 Edition). Grant Louw consents to the inclusion of such information in this Report in the form and context in which it appears.
The information in this report that relates to Exploration Results is based on information compiled by Neil Martin, who is a Member of the Australasian Institute of Geoscientists. Mr Martin has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2004 Edition of the 'Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves'. Mr Martin consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.
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| Whole Rock Analytical Results$ – BIF intervals Hole North (MGA) East (MGA) Dip/Az (mag) From (m) Length (m) Fe% SiO2% P% S% LOI% ZMARC027 347751 7490147 060/130 0 36 27.5 44.4 0.09 0.16 1.8 ZMARC028 347539 7490011 055/130 23 119 28.3 48.1 0.10 0.51 0.0 ZMARC029 347377 7489782 055/130 1 95 30.5 46.0 0.09 0.14 1.0 ZMARC029 and 114 20 32.9 43.7 0.10 0.47 1.5 ZMARC030 347270 7489574 055/085 83 55 36.5 35.9 0.12 0.30 5.8 ZMARC031 346999 7489611 055/160 12 78 30.6 44.1 0.10 0.40 0.1 ZMARC032 346739 7489519 055/130 50 78 32.3 44.9 0.10 0.40 0.0 ZMARC033 346734 7489527 090/000 78 66 32.5 45.1 0.09 0.46 0.0 ZMARC034 346260 7489076 055/130 42 71 27.5 49.3 0.08 0.45 0.0 |
Whole Rock Analytical Results$ – BIF intervals Hole North (MGA) East (MGA) Dip/Az (mag) From (m) Length (m) Fe% SiO2% P% S% LOI% ZMARC027 347751 7490147 060/130 0 36 27.5 44.4 0.09 0.16 1.8 ZMARC028 347539 7490011 055/130 23 119 28.3 48.1 0.10 0.51 0.0 ZMARC029 347377 7489782 055/130 1 95 30.5 46.0 0.09 0.14 1.0 ZMARC029 and 114 20 32.9 43.7 0.10 0.47 1.5 ZMARC030 347270 7489574 055/085 83 55 36.5 35.9 0.12 0.30 5.8 ZMARC031 346999 7489611 055/160 12 78 30.6 44.1 0.10 0.40 0.1 ZMARC032 346739 7489519 055/130 50 78 32.3 44.9 0.10 0.40 0.0 ZMARC033 346734 7489527 090/000 78 66 32.5 45.1 0.09 0.46 0.0 ZMARC034 346260 7489076 055/130 42 71 27.5 49.3 0.08 0.45 0.0 |
Whole Rock Analytical Results$ – BIF intervals Hole North (MGA) East (MGA) Dip/Az (mag) From (m) Length (m) Fe% SiO2% P% S% LOI% ZMARC027 347751 7490147 060/130 0 36 27.5 44.4 0.09 0.16 1.8 ZMARC028 347539 7490011 055/130 23 119 28.3 48.1 0.10 0.51 0.0 ZMARC029 347377 7489782 055/130 1 95 30.5 46.0 0.09 0.14 1.0 ZMARC029 and 114 20 32.9 43.7 0.10 0.47 1.5 ZMARC030 347270 7489574 055/085 83 55 36.5 35.9 0.12 0.30 5.8 ZMARC031 346999 7489611 055/160 12 78 30.6 44.1 0.10 0.40 0.1 ZMARC032 346739 7489519 055/130 50 78 32.3 44.9 0.10 0.40 0.0 ZMARC033 346734 7489527 090/000 78 66 32.5 45.1 0.09 0.46 0.0 ZMARC034 346260 7489076 055/130 42 71 27.5 49.3 0.08 0.45 0.0 |
Whole Rock Analytical Results$ – BIF intervals Hole North (MGA) East (MGA) Dip/Az (mag) From (m) Length (m) Fe% SiO2% P% S% LOI% ZMARC027 347751 7490147 060/130 0 36 27.5 44.4 0.09 0.16 1.8 ZMARC028 347539 7490011 055/130 23 119 28.3 48.1 0.10 0.51 0.0 ZMARC029 347377 7489782 055/130 1 95 30.5 46.0 0.09 0.14 1.0 ZMARC029 and 114 20 32.9 43.7 0.10 0.47 1.5 ZMARC030 347270 7489574 055/085 83 55 36.5 35.9 0.12 0.30 5.8 ZMARC031 346999 7489611 055/160 12 78 30.6 44.1 0.10 0.40 0.1 ZMARC032 346739 7489519 055/130 50 78 32.3 44.9 0.10 0.40 0.0 ZMARC033 346734 7489527 090/000 78 66 32.5 45.1 0.09 0.46 0.0 ZMARC034 346260 7489076 055/130 42 71 27.5 49.3 0.08 0.45 0.0 |
Whole Rock Analytical Results$ – BIF intervals Hole North (MGA) East (MGA) Dip/Az (mag) From (m) Length (m) Fe% SiO2% P% S% LOI% ZMARC027 347751 7490147 060/130 0 36 27.5 44.4 0.09 0.16 1.8 ZMARC028 347539 7490011 055/130 23 119 28.3 48.1 0.10 0.51 0.0 ZMARC029 347377 7489782 055/130 1 95 30.5 46.0 0.09 0.14 1.0 ZMARC029 and 114 20 32.9 43.7 0.10 0.47 1.5 ZMARC030 347270 7489574 055/085 83 55 36.5 35.9 0.12 0.30 5.8 ZMARC031 346999 7489611 055/160 12 78 30.6 44.1 0.10 0.40 0.1 ZMARC032 346739 7489519 055/130 50 78 32.3 44.9 0.10 0.40 0.0 ZMARC033 346734 7489527 090/000 78 66 32.5 45.1 0.09 0.46 0.0 ZMARC034 346260 7489076 055/130 42 71 27.5 49.3 0.08 0.45 0.0 |
Whole Rock Analytical Results$ – BIF intervals Hole North (MGA) East (MGA) Dip/Az (mag) From (m) Length (m) Fe% SiO2% P% S% LOI% ZMARC027 347751 7490147 060/130 0 36 27.5 44.4 0.09 0.16 1.8 ZMARC028 347539 7490011 055/130 23 119 28.3 48.1 0.10 0.51 0.0 ZMARC029 347377 7489782 055/130 1 95 30.5 46.0 0.09 0.14 1.0 ZMARC029 and 114 20 32.9 43.7 0.10 0.47 1.5 ZMARC030 347270 7489574 055/085 83 55 36.5 35.9 0.12 0.30 5.8 ZMARC031 346999 7489611 055/160 12 78 30.6 44.1 0.10 0.40 0.1 ZMARC032 346739 7489519 055/130 50 78 32.3 44.9 0.10 0.40 0.0 ZMARC033 346734 7489527 090/000 78 66 32.5 45.1 0.09 0.46 0.0 ZMARC034 346260 7489076 055/130 42 71 27.5 49.3 0.08 0.45 0.0 |
Whole Rock Analytical Results$ – BIF intervals Hole North (MGA) East (MGA) Dip/Az (mag) From (m) Length (m) Fe% SiO2% P% S% LOI% ZMARC027 347751 7490147 060/130 0 36 27.5 44.4 0.09 0.16 1.8 ZMARC028 347539 7490011 055/130 23 119 28.3 48.1 0.10 0.51 0.0 ZMARC029 347377 7489782 055/130 1 95 30.5 46.0 0.09 0.14 1.0 ZMARC029 and 114 20 32.9 43.7 0.10 0.47 1.5 ZMARC030 347270 7489574 055/085 83 55 36.5 35.9 0.12 0.30 5.8 ZMARC031 346999 7489611 055/160 12 78 30.6 44.1 0.10 0.40 0.1 ZMARC032 346739 7489519 055/130 50 78 32.3 44.9 0.10 0.40 0.0 ZMARC033 346734 7489527 090/000 78 66 32.5 45.1 0.09 0.46 0.0 ZMARC034 346260 7489076 055/130 42 71 27.5 49.3 0.08 0.45 0.0 |
Whole Rock Analytical Results$ – BIF intervals Hole North (MGA) East (MGA) Dip/Az (mag) From (m) Length (m) Fe% SiO2% P% S% LOI% ZMARC027 347751 7490147 060/130 0 36 27.5 44.4 0.09 0.16 1.8 ZMARC028 347539 7490011 055/130 23 119 28.3 48.1 0.10 0.51 0.0 ZMARC029 347377 7489782 055/130 1 95 30.5 46.0 0.09 0.14 1.0 ZMARC029 and 114 20 32.9 43.7 0.10 0.47 1.5 ZMARC030 347270 7489574 055/085 83 55 36.5 35.9 0.12 0.30 5.8 ZMARC031 346999 7489611 055/160 12 78 30.6 44.1 0.10 0.40 0.1 ZMARC032 346739 7489519 055/130 50 78 32.3 44.9 0.10 0.40 0.0 ZMARC033 346734 7489527 090/000 78 66 32.5 45.1 0.09 0.46 0.0 ZMARC034 346260 7489076 055/130 42 71 27.5 49.3 0.08 0.45 0.0 |
Whole Rock Analytical Results$ – BIF intervals Hole North (MGA) East (MGA) Dip/Az (mag) From (m) Length (m) Fe% SiO2% P% S% LOI% ZMARC027 347751 7490147 060/130 0 36 27.5 44.4 0.09 0.16 1.8 ZMARC028 347539 7490011 055/130 23 119 28.3 48.1 0.10 0.51 0.0 ZMARC029 347377 7489782 055/130 1 95 30.5 46.0 0.09 0.14 1.0 ZMARC029 and 114 20 32.9 43.7 0.10 0.47 1.5 ZMARC030 347270 7489574 055/085 83 55 36.5 35.9 0.12 0.30 5.8 ZMARC031 346999 7489611 055/160 12 78 30.6 44.1 0.10 0.40 0.1 ZMARC032 346739 7489519 055/130 50 78 32.3 44.9 0.10 0.40 0.0 ZMARC033 346734 7489527 090/000 78 66 32.5 45.1 0.09 0.46 0.0 ZMARC034 346260 7489076 055/130 42 71 27.5 49.3 0.08 0.45 0.0 |
Whole Rock Analytical Results$ – BIF intervals Hole North (MGA) East (MGA) Dip/Az (mag) From (m) Length (m) Fe% SiO2% P% S% LOI% ZMARC027 347751 7490147 060/130 0 36 27.5 44.4 0.09 0.16 1.8 ZMARC028 347539 7490011 055/130 23 119 28.3 48.1 0.10 0.51 0.0 ZMARC029 347377 7489782 055/130 1 95 30.5 46.0 0.09 0.14 1.0 ZMARC029 and 114 20 32.9 43.7 0.10 0.47 1.5 ZMARC030 347270 7489574 055/085 83 55 36.5 35.9 0.12 0.30 5.8 ZMARC031 346999 7489611 055/160 12 78 30.6 44.1 0.10 0.40 0.1 ZMARC032 346739 7489519 055/130 50 78 32.3 44.9 0.10 0.40 0.0 ZMARC033 346734 7489527 090/000 78 66 32.5 45.1 0.09 0.46 0.0 ZMARC034 346260 7489076 055/130 42 71 27.5 49.3 0.08 0.45 0.0 |
Whole Rock Analytical Results$ – BIF intervals Hole North (MGA) East (MGA) Dip/Az (mag) From (m) Length (m) Fe% SiO2% P% S% LOI% ZMARC027 347751 7490147 060/130 0 36 27.5 44.4 0.09 0.16 1.8 ZMARC028 347539 7490011 055/130 23 119 28.3 48.1 0.10 0.51 0.0 ZMARC029 347377 7489782 055/130 1 95 30.5 46.0 0.09 0.14 1.0 ZMARC029 and 114 20 32.9 43.7 0.10 0.47 1.5 ZMARC030 347270 7489574 055/085 83 55 36.5 35.9 0.12 0.30 5.8 ZMARC031 346999 7489611 055/160 12 78 30.6 44.1 0.10 0.40 0.1 ZMARC032 346739 7489519 055/130 50 78 32.3 44.9 0.10 0.40 0.0 ZMARC033 346734 7489527 090/000 78 66 32.5 45.1 0.09 0.46 0.0 ZMARC034 346260 7489076 055/130 42 71 27.5 49.3 0.08 0.45 0.0 |
|---|---|---|---|---|---|---|---|---|---|---|
| Hole | North (MGA) |
East (MGA) |
Dip/Az (mag) |
From (m) |
Length (m) |
Fe% | SiO2% | P% | S% | LOI% |
| ZMARC027 | 347751 | 7490147 | 060/130 | 0 | 36 | 27.5 | 44.4 | 0.09 | 0.16 | 1.8 |
| ZMARC028 | 347539 | 7490011 | 055/130 | 23 | 119 | 28.3 | 48.1 | 0.10 | 0.51 | 0.0 |
| ZMARC029 | 347377 | 7489782 | 055/130 | 1 | 95 | 30.5 | 46.0 | 0.09 | 0.14 | 1.0 |
| ZMARC029 | and | 114 | 20 | 32.9 | 43.7 | 0.10 | 0.47 | 1.5 | ||
| ZMARC030 | 347270 | 7489574 | 055/085 | 83 | 55 | 36.5 | 35.9 | 0.12 | 0.30 | 5.8 |
| ZMARC031 | 346999 | 7489611 | 055/160 | 12 | 78 | 30.6 | 44.1 | 0.10 | 0.40 | 0.1 |
| ZMARC032 | 346739 | 7489519 | 055/130 | 50 | 78 | 32.3 | 44.9 | 0.10 | 0.40 | 0.0 |
| ZMARC033 | 346734 | 7489527 | 090/000 | 78 | 66 | 32.5 | 45.1 | 0.09 | 0.46 | 0.0 |
| ZMARC034 | 346260 | 7489076 | 055/130 | 42 | 71 | 27.5 | 49.3 | 0.08 | 0.45 | 0.0 |
Davis Tube Recovery Analytical Results – BIF intervals
| Hole | Mass Recovery |
Fe% | SiO2% | P% | S% |
|---|---|---|---|---|---|
| ZMARC027 | 11.0 | 69.4 | 1.5 | 0.02 | 0.64 |
| ZMARC028 | 22.9 | 69.6 | 2.1 | 0.01 | 1.09 |
| ZMARC029 | 20.5 | 69.6 | 2.2 | 0.01 | 0.01 |
| ZMARC029 | 27.0 | 71.2 | 1.2 | 0.01 | 0.02 |
| ZMARC030 | 23.1 | 70.9 | 1.1 | 0.01 | 0.01 |
| ZMARC031 | 26.5 | 69.6 | 2.2 | 0.01 | 0.62 |
| ZMARC032 | 30.0 | 69.8 | 1.9 | 0.01 | 1.11 |
| ZMARC033 | 36.1 | 69.9 | 2.0 | 0.00 | 0.96 |
| ZMARC034 | 24.0 | 69.0 | 2.4 | 0.00 | 1.41 |
$ RC Samples were collected on the rig as 1m samples riffle split to ~3kg. Samples were then further riffle split and composited to nominal 4m intervals adjusted for geological boundaries. Samples were submitted to ALS in Wangara. Samples were composited from crushed drill sample residues and 150grams of each was control ground to p80 passing 40 microns. A 20 gram sub sample was then used for Davis tube recovery (Magnetic Field Strength: 3000 Gauss; Washing Time: 20 minutes; Tube Angle: 45 Degrees; Wash Water Flow-rate: 540ml/Minute; Tube Oscillation/Stroke: 60 cycles per minute). Resulting concentrate from the Davis Tube was collected and weighed. Non-magnetics were not collected. Size Fractions were determined by wet sieving. Analysis - fusion XRF for Fe, TiO 2, Al2O3, CaO, MgO, SiO2, at 0.01% detection limit, Na2O at 0.005% detection limit, Mn,P, S, As, K2O, Ni, V, Pb, Zn, Cu, Co, Ba, Cl, Sn, Sr, Zr at 0.001% detection limit, and Cr2O3 at 0.0006% detection limit. LOI was determined gravimetrically in a thermal gravimetric analyser at 1000 degrees C. Certified reference materials were submitted with the field samples at a rate of 5% and 5% of samples were tested for sizing by wet sieving – the results of which indicate no significant issues.
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