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DART MINING NL — Regulatory Filings 2013
May 7, 2013
64792_rns_2013-05-07_3a61f08f-6540-4a1f-b549-1136200e8926.pdf
Regulatory Filings
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ASSAY DATA CONFIRMS HIGH GRADE MOLY ZONE BELOW 690m – DUNDD012 CURRENTLY AT 1002m
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ASX ANNOUNCEMENT
8 MAY 2013
ASX Code: DTM
Investment Data
Shares on issue 207M Unlisted options 18.2M
Shareholders Top 20 Hold 40%
Key Projects / Metals
• Unicorn Porphyry Mo-Cu-Ag
• Morgan Porphyry Mo-Ag-Au
• Mountain View Lode – Au
Mo – Molybdenum
Cu – Copper
Au – Gold
Ag – Silver
Board & Management
Chairman Mr Chris Bain
Managing Director Mr Lindsay Ward
Executive Director Mr Dean Turnbull Manager – Exploration
Non-Executive Directors Mr Stephen Poke Mr Richard Udovenya
Contact Details Dart Mining NL Level 2, 395 Collins Street Melbourne VIC 3000 Australia
Mr Lindsay Ward Phone: +61 (0)3 9621 1299 Email: [email protected]
Visit our webpage: www.dartmining.com.au
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Fifth high grade zone intersection from 692m with a possible sixth at 990m
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18m @ 0.09% Mo from 692m (Inc 12m @ 0.1% Mo) within 56m
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mineralised zone
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Visible Mo showing at 990m associated with a new Rhyolitic pulse
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Stacked high grade mineralisation confirmed below 700m depth
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Target depth of 1200m expected end May
Dart Mining (DTM:ASX) is pleased to announce that DUNDD012, the first hole to test the depth extension of the Unicorn Mo + Cu + Ag deposit below 700m, has confirmed the continuation of high grade molybdenum horizons. Drilling is currently at 1002m and expected to reach the target depth of 1200m by the end of May.
A new high Mo grade horizon has been intersected from 692m showing 18m at 0.09% Mo (including 12m @ 0.1% Mo) within a larger zone of 56m @ 0.06% Mo – refer Table 1 and Appendix 1. Deeper mineralisation at Unicorn would appear to be more like other primary molybdenum deposits as it does not show significant copper, consistent with the Climax-style porphyry model applied to the Unicorn deposit.
Importantly, the deeper molybdenum dominant mineralisation maintains significant grades of rhenium, which may add economic value to the Unicorn project in the final processing phase.
“While to date only a single deep drill hole has tested the porphyry at depths below 700m, the intersection of a fifth high grade mineralisation horizon, and possibly a sixth below 990m, is consistent with the Climax-style mineralisation model. This adds confidence in the long term underground potential of the project,” said Lindsay Ward, Dart Mining’s Managing Director.
A single deep drill hole within a system that could measure 1 square kilometre or more at a depth of 1200m is not sufficient to develop a three dimensional model of the deposit. Further deep drilling is required to determine the lateral extent of the porphyry at depth or to determine the relative position of the drill hole to the mineralised porphyry pulses. As such, additional drilling will target the best position to host multiple overlapping porphyry pulses likely to generate very high grade mineralisation.
“The initial success of this hole hitting high grade horizons within a body that could be 1 square kilometre or more in size gives confidence that the Unicorn deposit could support a long term open pit and underground operation. Further drilling is needed to assess the full potential and estimate the underground resource,” Lindsay Ward said.
The interpreted high grade zone below 690m in DUNDD012 represents the fifth known horizon of high grade mineralisation within Unicorn, is some 200m below the recently discovered M4 zone (intersected in DUNDD008 – refer Figure 1) and some 700m below surface. The 200m interval between M4 and this additional high grade zone remains poorly tested in the northern part of the deposit due to insufficient drilling. But there is clear potential for additional high grade intervening zones within this untested 200m in the northern portion of the porphyry (refer Figure 1).
At approximately 990m DUNDD012 intersected a narrow rhyolitic porphyry that shows well-preserved Unidirectional Solidification Textures (USTs – refer Figure 1). These rock textures are associated with the edges and top of individual pulses of porphyry with crystal growth directions indicating a new porphyry pulse lies to the east of DUNDD012. The intersection shows associated narrow, steep radial quartz veins with coarse visible molybdenum (refer Photo 1) and high temperature potassic alteration halos to each vein (pink zone adjacent to quartz vein in Photo 1). This form of alteration is indicative that additional mineralisation occurs below the current drill hole.
DUNDD012 will be extended from its current depth of 1002m to 1200m after rig repairs, with a target completion date of the end of May.
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Photograph 1. Narrow radial quartz stockwork veins showing coarse visible molybdenum with potassic alteration halos, approximately 990m depth. NQ sized drill core: Two dollar coin for scale
Table 1. Significant Assay Intervals – DUNDD012
| Hole No. | Hole Dip | Hole Azimuth (MGA Grid) |
MGA East (m) |
MGA North (m) |
RL AHD (m) |
Total Depth (m) |
|---|---|---|---|---|---|---|
| DUNDD012 | -86.8 | 164.5 | 588,790.0 | 5,977,854.0 | 814 | ON GOING |
| Collar co-ordinates are measured by GPS location. | ||||||
| Hole No. |
From (m) |
To (m) |
Significant Intersections MoEq (1) |
Significant Intersections (Mo) |
Significant Intersections (Cu) |
Significant Intersections (Ag) |
| DUNDD012 | 692 | 748 | [email protected]% MoEq | [email protected]% Mo | [email protected] Ag | |
| 692 | 698 | Inc: 6m@ 0.11% MoEq | Inc: 6m@ 0.1% Mo | |||
| 692 | 706 | Inc: 14m@ 4.10ppm Ag | ||||
| 722 | 730 | Inc: 8m@ 3.34ppm Ag | ||||
| 730 | 748 | Inc: 18m@ 0.09% MoEq | Inc: 18m@ 0.09% Mo |
Analysis performed on 1/2 HQ or NQ core over nominal 2m intervals with the assay data length weighted over each reported interval. Mo, Cu and Ag are analysed by four acid digest methods (ALS Technique ME-MS61r) at an acredited Australian Laboratory. Mo > 50ppm trigger XRF follow up assay (ALS Technique XRF05).
Samples are crushed, riffel split and pulverised prior to multielement analysis.
Note 1.
MoEq[1] (Molybdenum Equivalent) = Mo + (Cu/3.44) + (Ag x34.3) ( assumes equal metallurgical recovery for each metal )
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Figure 1: Composite Long Section looking east showing geological interpretation, DUNDD008, completed metallurgical/ geotechnical drilling and the first assay results of the second deep drill hole (DUNDD012 –underway)
About Dart Mining
Dart Mining NL (ASX:DTM) is a Melbourne-based exploration and development company that has discovered and is seeking to develop a new mineralised porphyry province in north east Victoria. The Dart province hosts molybdenum (Mo), copper (Cu), silver (Ag), zinc (Zn), tin (Sn) and gold (Au) mineralisation in porphyry igneous intrusions. It lies adjacent to the Gilmore suture with numerous intersecting splay faults. NSW is a proven host of world class porphyry mines associated with splay structures off the Gilmore Suture such as North Parkes, Cadia and Ridgeway, as is the Stockman Copper, Zinc, Silver and Gold VMS project, which is at an advanced stage of development in Victoria about 35km south of Dart Mining’s tenements.
The Unicorn Project, which is Dart Mining’s principal project, is a molybdenum (Mo), copper (Cu) and silver (Ag) Climax-style porphyry that has similar geological characteristics to the world class Henderson Climax-style primary Mo porphyry mine in Colorado USA. The Unicorn Project has a number of unique characteristics. It outcrops, has an extensive high grade zone from surface, is about 20km from the National Electricity Market infrastructure (hydro generation, switchyards and transmission lines), has abundant water onsite, road access, an existing logistics chain from mine to market, no known native title, flora or fauna issues and strong Corryong community and government support.
Dart Mining completed a detailed preliminary economic assessment (scoping study) for the Unicorn Project in October 2012. It yielded compelling economic results and warranted the undertaking by Dart Mining of the proposed prefeasibility studies. The Prefeasibility Study for Unicorn is underway with a targeted completion date of Q1 2014.
About Molybdenum
Molybdenum is both a traditional and new age/future metal with unique characteristics. Its primary use is as an essential metal in the manufacture of steel as it adds strength, hardness, toughness and resistance to corrosion. Molybdenum also has a range of chemical uses including acting as a catalyst to remove impurities, notably sulphur, during crude oil production. Molybdenum is also used in the paint and plastics industries.
World demand for molybdenum is growing at 4% to 6% pa and new uses for molybdenum continue to be discovered. A recent example is the development by two Australian scientists of a new two-dimensional material using molybdenum oxide that they believe could revolutionise the electronics market by facilitating thinner, faster and lighter gadgets. This continues molybdenum’s diversification into areas and uses in addition to its traditional use in steel production.
The use of molybdenum is also growing in the renewable energy sector where it is used in the manufacture of solar panels and, potentially, as an electrode plate for the separation of hydrogen and oxygen to produce hydrogen energy. Molybdenum is also used in nano-technologies to make electrical goods smaller.
COMPETENT PERSON’S STATEMENT
Information in this report that relates to a statement of Exploration Results and Mineral Resources of the Company is based on information compiled by Dean Turnbull B.App.Sc.(Geol) Hons. M. AIG. Mr Turnbull is a Director and full time employee of Dart Mining NL and has sufficient experience relevant to the style of mineralisation and type of deposits under consideration and to the activity he has undertaken to qualify as a competent person as defined in the 2004 Edition of the “Australasian Code for Reporting of Mineral Resources and Ore Reserves” (or “JORC Code”). Mr Turnbull has provided written consent to the inclusion in the report of the matters based on his information in the form and context in which it appears.
APPENDIX 1: ASSAY DATA LISTING DUNDD012.
| APPENDIX 1: ASSAY DATA LISTING DUNDD012. | APPENDIX 1: ASSAY DATA LISTING DUNDD012. | APPENDIX 1: ASSAY DATA LISTING DUNDD012. | APPENDIX 1: ASSAY DATA LISTING DUNDD012. | APPENDIX 1: ASSAY DATA LISTING DUNDD012. | APPENDIX 1: ASSAY DATA LISTING DUNDD012. | |||
|---|---|---|---|---|---|---|---|---|
| Mo > 300 | Cu > 1000 | Ag > 2 | ||||||
| HOLE ID | SAMPLE | FROM(m) | TO(m) | RECOVERY % |
INTERVAL (m) |
Mo(ppm) | Cu(ppm) | Ag (ppm) |
| DUNDD012 | 101552 | 690 | 692 | 100 | 2 | 238 | 51.2 | 0.34 |
| DUNDD012 | 101553 | 692 | 694 | 100 | 2 | 714 | 80 | 0.35 |
| DUNDD012 | 101554 | 694 | 696 | 100 | 2 | 408 | 36.4 | 0.75 |
| DUNDD012 | 101555 | 696 | 698 | 100 | 2 | 1670 | 52.7 | 17.25 |
| DUNDD012 | 101556 | 698 | 700 | 100 | 2 | 421 | 72.2 | 2.04 |
| DUNDD012 | 101557 | 700 | 702 | 100 | 2 | 264 | 55.8 | 5.41 |
| DUNDD012 | 101558 | 702 | 704 | 100 | 2 | 269 | 44.7 | 0.87 |
| DUNDD012 | 101559 | 704 | 706 | 100 | 2 | 99 | 39.4 | 2.01 |
| DUNDD012 | 101560 | 706 | 708 | 100 | 2 | 251 | 25.4 | 0.48 |
| DUNDD012 | 101561 | 708 | 710 | 100 | 2 | 470 | 18 | 0.22 |
| DUNDD012 | 101562 | 710 | 712 | 100 | 2 | 229 | 22.1 | 0.2 |
| DUNDD012 | 101563 | 712 | 714 | 100 | 2 | 444 | 25.8 | 0.3 |
| DUNDD012 | 101564 | 714 | 716 | 100 | 2 | 219 | 23.7 | 0.67 |
| DUNDD012 | 101565 | 716 | 718 | 100 | 2 | 447 | 35.8 | 0.45 |
| DUNDD012 | 101566 | 718 | 720 | 100 | 2 | 415 | 16.1 | 0.31 |
| DUNDD012 | 101567 | 720 | 722 | 100 | 2 | 425 | 34.3 | 0.34 |
| DUNDD012 | 101568 | 722 | 724 | 100 | 2 | 461 | 30.9 | 2.3 |
| DUNDD012 | 101569 | 724 | 726 | 100 | 2 | 429 | 20.1 | 5.05 |
| DUNDD012 | 101570 | 726 | 728 | 100 | 2 | 383 | 124.5 | 3.65 |
| DUNDD012 | 101571 | 728 | 730 | 100 | 2 | 293 | 13.2 | 2.35 |
| DUNDD012 | 101572 | 730 | 732 | 100 | 2 | 778 | 18.5 | 0.31 |
| DUNDD012 | 101576 | 732 | 734 | 100 | 2 | 685 | 17.6 | 0.4 |
| DUNDD012 | 101577 | 734 | 736 | 100 | 2 | 822 | 17.9 | 0.3 |
| DUNDD012 | 101578 | 736 | 738 | 100 | 2 | 954 | 31.1 | 0.17 |
| DUNDD012 | 101579 | 738 | 740 | 100 | 2 | 1180 | 21.3 | 0.16 |
| DUNDD012 | 101580 | 740 | 742 | 100 | 2 | 1395 | 42.6 | 0.2 |
| DUNDD012 | 101581 | 742 | 744 | 100 | 2 | 371 | 23 | 0.13 |
| DUNDD012 | 101582 | 744 | 746 | 100 | 2 | 747 | 33 | 0.15 |
| DUNDD012 | 101583 | 746 | 748 | 100 | 2 | 817 | 19.6 | 0.18 |
| DUNDD012 | 101584 | 748 | 750 | 100 | 2 | 285 | 11.3 | 0.11 |