EDITOR: | November 14th, 2013

Energia Minerals Limited: Resource drilling intersects significant widths of high-grade uranium at Carley Bore

| November 14, 2013 | No Comments
image_pdfimage_print

November 14, 2013 (Source: Energia Minerals) — Energia Minerals Limited (ASX: EMX) is pleased to report that the recently completed resource infill drilling program at its 100% owned Carley Bore uranium deposit in Western Australia has confirmed the consistency of uranium mineralisation in all of the three areas targeted for further definition drilling, highlighting the potential to upgrade the resource.

A total of 33 large diameter aircore holes were drilled within the first of these areas (Zone 6 on the attached plan) and mineralised samples will now be submitted for geochemical analysis. Of these holes, 25 within the mineralised envelope were successfully down-hole gamma logged producing excellent results (see Table 1 attached) including the following:

  • LYAC0445             9.78 m grading 408ppm eU3O8
  • LYAC0448             4.56 m grading 1,384ppm eU3O8
  • LYAC0453             7.30 m grading 670ppm eU3O8
  • LYAC0458             6.10 m grading 683ppm eU3O8

Holes LYAC0454 and LYAC0460 also encountered very strong mineralisation over at least 10 metres and 5 metres respectively. However, gamma data from both of these holes require either additional processing or re-logging. As an indication of the strength of the mineralisation in these two holes, analysis by hand-held XRF returned an intersection of 10 metres grading 475ppm U3O8  in hole LYAC0454.

When final geochemical assays are received in approximately three weeks’ time, a detailed comparison of the geochemical results against the down-hole gamma logging results will be undertaken. In tandem with this, a revised resource estimate and updated Scoping Study utilising only the geochemical assays will be carried out by Coffey Mining. The new resource and Scoping Study results are expected to be available early in the first quarter of 2014.

Energia’s Managing Director, Kim Robinson, said the Company was very pleased with the excellent results received from the drilling campaign, with the drilling further enhancing the robustness of the Carley Bore deposit.

“This work clearly reinforces the potential to underpin a high quality In-Situ Recovery (ISR) mining operation at Carley Bore” Mr Robinson said. “We are looking forward to receiving the remaining data from the drilling program, updated resource estimate and Scoping Study, paving the way for this project to advance to the next stage”

Shareholders will be advised of gamma log results from the remaining two areas as they come to hand and will also be advised of down hole, density, resistivity, self- potential, sizing analysis and sonic logging results.

Competent Person Statement: 

Information in this release that relates to Exploration Results is based on information prepared by Mr Kim Robinson who is a Member of the Australian Institute of Geoscientists and a full-time employee of Energia Minerals Limited. Mr Robinson has sufficient experience which is relevant to the styles of mineralisation and types of deposits under consideration and to the activities being undertaken 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 Robinson consents to the inclusion in this release of the matters based on his information in the form and context in which it appears.

Information in this report relating to De-convolved Downhole Gamma Results is based on information compiled by Mr David Wilson BSc MSc who is a Member of the Australasian Institute of Mining and Metallurgy.  Mr Wilson is a full-time employee of 3D Exploration Ltd, and a consultant to Energia 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 as defined in the 2004 Edition of the ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves’.  Mr Wilson consents to the inclusion in this release of the matters based on his information in the form and context in which it appears.

Holes at Carley Bore were logged in October – November 2013 by Borehole Geophysical Services (BHGS) of Malaga WA. Readings were averaged over 2 cm intervals then transferred to Mr Wilson for processing.  The down-hole gamma ray data was converted from counts per second to eU3O8  and adjusted to take into account differences in drill hole size, casing materials and water content. The eU3O8 data has been filtered (de-convolved) to more closely reproduce the true grades and thicknesses where thin narrow zones are encountered.  The various calibration factors and de-convolution parameters were established and applied by David Wilson BSc MSc MAusIMM from 3D Exploration Ltd based in Perth, Western Australia.

Equivalent U3O8 (commonly stated as “eU3O8”) derived from down-hole gamma logging of drill holes is a well-established method that provides a powerful tool for uranium companies to explore for and evaluate uranium deposits.  The method measures the total flux of natural gamma rays emitted from materials within a radius of about 35cm surrounding a drill hole.  The gamma probe is therefore capable of sampling a much larger volume than is the case by analysing geological samples recovered from the hole.

The  gamma  ray  measurements  are  used  to  estimate  uranium  concentrations  with  the  commonly  accepted  initial assumption being that the uranium is in (secular) equilibrium with those of its daughter products which are the principal gamma ray emitters.  If uranium is not in equilibrium as a result of lack of time since formation or of the subsequent redistribution (depletion or enhancement) of uranium and/or its daughter products, then the true uranium concentration in the holes logged using the gamma probe will be higher or lower than those reported

Cautionary Note: Hand-held portable field XRF results are generally a reliable estimate of U3O8 grade. However, they are no substitute for conventional analytical assays and all samples have been submitted for assay using wet chemical techniques, with results expected within three weeks.

The XRF analysis hole LYAC0454 was carried out on composite un-sieved grab samples from one metre aircore drilling intervals. These samples were placed and compacted into a chip tray, allowed to dry and analysed for 30 seconds each, using a 10 second measurement for three analyte sweeps on each sample. Previous experience by Energia in previous drilling programs has confirmed this technique produces results that compare favourably with final laboratory assays in the range 100-800 ppm U3O8.

TABLE 1: Carley Bore aircore drillhole locations and deconvolved uranium oxide grades (eU3O8). 

Intersections calculated at a 100ppm eU3O8 cut-off grade

Hole ID Easting

MGAZ50

Northing

MGAZ50

From

(metres)

To

(metres)

eU3O8

(ppm)

Thickness

(metres)

Depth

(metres)

LYAC0443 296946 7395919 31.04 32.08 152.13

1.04

54.0

LYAC0444 296547 7395894 44.26 44.86 374.37

0.60

54.0

LYAC0445 296441 7395896 53.92 63.70 408.14

9.78

64.0

LYAC0446 296845 7395904 50.62 54.80 644.08

4.18

57.0

* LYAC0447 296948 739087 51.78 56.98 128.85

5.20

59.0

LYAC0448 296849 7396072 49.08 53.64 1383.82

4.56

57.0

LYAC0449 296747 7396078 Lower section not logged

54.0

LYAC0450 296645 7396076 37.88 38.96 128.15

1.08

56.0

LYAC0450     50.74 55.84 368.83

5.10

 
LYAC0451 296555 7396084 41.50 42.68 278.97

1.18

56.0

LYAC0451     47.56 48.94 508.62

1.38

 
LYAC0451     53.56 56.04 298.09

2.48

 
LYAC0452 296446 7396086 45.22 46.24 232.16

1.02

54.0

LYAC0453 296347 7396088 47.28 54.58 670.38

7.30

56.0

LYAC0454 296255 7396088 Remains to be calculated or re-logged

62.0

LYAC0455 296844 7396227 50.22 51.32 203.69

1.10

54.0

LYAC0456 296753 7396230 50.82 56.62 313.27

5.80

56.0

LYAC0457 296656 7396230 49.78 52.76 359.84

2.98

54.0

LYAC0458 296540 7396237 37.62 42.72 198.51

5.10

55.0

LYAC0458    

47.7

53.80 683.03

6.10

 
* LYAC0459 296431 7396235 42.54 44.06 455.58

1.52

54.0

LYAC0460 296352 7396227 Remains to be calculated or re-logged

54.0

LYAC0461 296258 7396242 Hole lost after geochemical sampling

59.0

LYAC0462 296356 7396395 45.18 48.74 423.71

3.56

59.0

LYAC0463 296457 7396391 48.42 55.18 480.34

6.76

56.0

LYAC0464 296556 7396381 49.60 51.66 172.20

2.06

53.0

LYAC0465 296652 7396391 47.28 49.38 299.49

2.10

53.0

* LYAC0466 296302 7396590 47.56 49.02 276.00

1.46

52.0

LYAC0467 296402 7396588 46.70 52.92 425.24

6.22

54.0

LYAC0468 296488 7396590 48.84 50.54 616.06

1.70

54.0

LYAC0469 296496 7396768 Hole lost after geochemical sampling

54.0

LYAC0470 296399 7396761 Hole lost after geochemical sampling

58.0

LYAC0471 296301 7396765 46.34 48.72 254.56

2.38

51.0

LYAC0472 296370 7396929 53.14 54.86 366.41

1.72

59.0

LYAC0473 296274 7396930 46.28 50.68 245.41

4.40

55.0

* Incomplete log

Figure 1: Carley Bore Zone 6

Figure 1: Carley Bore Zone 6


Raj Shah

Editor:

Raj Shah has professional experience working for over a half a dozen years at financial firms such as Merrill Lynch and First Allied Securities Inc., ... <Read more about Raj Shah>


Copyright © 2017 InvestorIntel Corp. All rights reserved. More & Disclaimer »


Leave a Reply

Your email address will not be published. Required fields are marked *