Fermer X Les cookies sont necessaires au bon fonctionnement de 24hGold.com. En poursuivant votre navigation sur notre site, vous acceptez leur utilisation.
Pour en savoir plus sur les cookies...
AnglaisFrancais
Cours Or & Argent en

Nyota Minerals Limited

Publié le 03 février 2010

Tulu Kapi metallurgical test results

( 0 vote, 0/5 ) Imprimer l'article
  Article Commentaires Commenter Notation Suivre la société  
0
envoyer
0
commenter
Mots clés associés :   K Street | Nickel |

 

ANNOUNCEMENT - TULU KAPI METALLURGICAL TEST RESULTS

 

3 February 2010

 

Nyota Minerals Limited (?Nyota? or the ?Company?)

 

TULU KAPI METALLURGICAL TEST RESULTS

 

 

Highlights

?               Test work results demonstrate highly encouraging average gold recoveries from Tulu Kapi ore samples

?               Recoveries in excess of 95% achieved

?               Results will support prefeasibility level capital and operating cost estimates for a gold recovery plant at Tulu Kapi

?               Results demonstrate the potential for high recoveries and low operating costs when Tulu Kapi commences production

 

 

 

Nyota Minerals Limited (AIM:NYO/ASX:NYO), which is focused on the exploration and development of gold and nickel projects in Africa, is pleased to announce highly encouraging results from the metallurgical test work program completed on samples from its Tulu Kapi gold project, Ethiopia, in January 2010.

Nyota Director, Dr Evan Kirby, selected samples totaling 277kg in weight for the metallurgical test work during a site visit to Tulu Kapi in December 2009.  The samples were taken from diamond drill core from the exploration drilling that formed the basis for the maiden JORC resource estimate of 690,000 ounces.  Samples were taken from both Lodes One and Two.  The metallurgical test work was conducted at AMMTEC Laboratories in Perth, Australia.

The results are considered extremely encouraging and demonstrate the potential for high recoveries and low operating costs when Tulu Kapi commences production.

Melissa Sturgess, Nyota CEO, commented ?we couldn?t be more encouraged by these test results.  The sample of about 300kg is significant and the testwork was done to prefeasibility standards in a world class laboratory, giving us a high level of confidence that when Tulu Kapi commences production we will be able to build a low cost processing plant to extract the gold from the ore.?  

Summarised Results

 

TESTWORK DETAILS

RESULTS

Lode One

Lode Two

 

Head Analysis

Gold g/t

3.47

5.17

Silver g/t

1.55

4.69

Sulfur %

2.5

2.25

Silica %

61.7

57.3

 

Comminution Parameters

Bond Rod Mill Work Index (kWh/tonne)

17.4

19.1

Bond Ball Mill Work Index (kWh/tonne)

16.3

18.2

Bond Abrasion Index

0.50

0.58

 

Cyanidation

Gold dissolution % at grind P80 of 75 microns

98.1

98.6

Gold dissolution at grind P80 of 150 microns

95.1

96.2

 

Bulk Rougher Froth Flotation

Gold recovery % at grind P80 of 75 microns

99.5

96.1

Gold recovery % at grind P80 of 150 microns

99.5

96.1

 

 

Details of the Test work

The comminution test work used standard methods and equipment.  Closing screen sizes of 1120 microns and 106 microns were used in the Bond Rod Mill and Ball Mill tests.

The cyanidation work comprised a series of monitored bottle-roll tests, each with duration 24 hours.  Leaching conditions included a lime addition rate of 0.3 kg/t and cyanide solution strength of 0.050%.  An oxygen atmosphere was used in the leaching bottles.  No supplementary cyanide or lime additions were made during the leaches.

The bulk flotation tests were conducted on one kilogram portions of sample in a standard laboratory flotation cell.  The duration of each float was 15 minutes.  In all cases, the mass pull to concentrate was about 10% of the feed mass. 

Selection of The Metallurgical Testwork Samples

All intersections shown on the geological sections were reviewed; a realistic mining width for each intersection was estimated and the value in g.m (g/t * meters width) was calculated.   Intersections with values less than 5 g.m were not considered for sampling.

Intersections with values greater than 5 g.m were then selected from the upper and lower lodes (Lode One and Lode Two respectively).  The half core from these intersections was then sawn and portions of quarter core were taken for the composites.  The average intersection widths and estimated average grades in Lodes One and Two composites were 11.1 m @ 3.1 g/t and 7.2 m @ 4.9 g/t respectively. 

The intersections making up the Lode One and Lode Two composites are summarized below in Tables One and Two.

Table One
Intersections Comprising the Lode One Composite

Section

Hole

From

To

Width

(m)

Grade

(g/t)

Value

(g.m)

Actual Weight
(kg)

160S

14

59

63.8

4.8

7.37

35

7

160S

14

93.77

98.2

4.43

2.91

13

6

80S

12

56.63

68.4

11.77

4.6

54

20.2

80S

10

31

48.7

17.7

5.37

95

23.5

80S

10

63.75

75.15

11.4

1.8

21

15.8

0

8

64.9

98.85

33.95

1.82

62

64

0

8

107

111.05

4.05

5.79

23

4.5

0

20

94.1

101.9

7.8

1.81

14

9

0

20

114

118.3

4.3

2.08

9

4.2

 

The total weight of the lode one composite was 154 kg.

 

Table Two
Intersections Comprising the Lode Two Composite

Section

Hole

From

To

Width

(m)

Grade

(g/t)

Value

(g.m)

Actual Wt
(kg)

240S

25

187.7

192.56

4.86

8.95

43

5.2

160S

26

161

174

13

3.69

48

23

160S

17

137

141

4

4.68

19

4.2

80S

27

212

231.68

19.68

5.01

99

36

80S

10

201

203.82

2.82

9.24

26

2.6

0

8

215.61

242.62

27.01

1.74

47

25

0

20

201

205

4

11.26

45

4

0

20

215.19

217

1.81

3.06

6

1.9

0

20

245

247

2

5.02

10

2

80N

33

207

209.64

2.64

21.2

56

2.6

160N

6

150.12

154.63

4.51

7.08

32

4.5

160N

31

178

182.2

4.2

5.17

22

7

160N

31

212.7

215.4

2.7

3.8

10

5.0

 

The total weight of the lode two composite was 123 kg.

Prefeasibility Study Use of the Testwork Results

The test work results will be used to generate pre-feasibility level estimates of the capital and operating costs of gold recovery plants for Tulu Kapi.  The comminution parameters will be used to specify crushing and grinding equipment and estimate wear parts consumption.  The cyanidation and froth flotation results will be used to specify equipment requirements and estimate operating costs and gold recoveries.

Two alternative flow sheets will be considered.  The first consists of crushing and grinding followed by conventional CIP gold recovery.  This is the standard flow sheet used throughout the world where the ore is ?free milling?, i.e. gold can be cyanide leached from finely ground ore. 

An alternative flowsheet involving the production of a concentrate and then cyanidation of the concentrate will also be considered.  This flowsheet has advantages in environmentally sensitive areas and has been implemented in a number of recent gold plants.

In the alternative, the ore is crushed and milled and then gold recovered to a concentrate with a mass of less than 10% of the feed by means of gravity concentration and froth flotation.  The non-toxic tailings from this process, comprising more than 90% of the mass of ore, can be stored in a simple tailings storage facility.  Excess water can be discharged to the environment. 

The concentrate is then subject to intensive cyanidation to recover the gold.  Cyanide is recycled in the leach process and the tailings are detoxified to destroy any residual cyanide.  The tailings from concentrate leaching are then either sold for the sulfur content, or stored in a secure impoundment.

For further information please contact:

 

Melissa Sturgess

Nyota Minerals Limited

(+44) (0)78 2555 1397 or melissa.sturgess@nyotaminerals.com

 

Richard Brown/ Richard Greenfield

Ambrian Partners Limited

(+44) (0)20 7634 4700

 

Press enquiries

Charlie Geller or Leesa Peters

Conduit PR

+44 (0)20 7429 6604/ +44 (0)75 2823 3383

 

Or visit: http://www.nyotaminerals.com

 

The technical exploration and mining information contained in this Announcement has been reviewed and approved by Dr Evan Kirby. Dr Kirby 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' and as a qualified person under the AIM Note for Mining, Oil and Gas Companies. Dr Kirby is a director of Nyota Minerals Limited and is a member of the Australasian Institute of Mining and metallurgy (Aus.I.M.M). Dr Kirby consents to the inclusion in this Announcement of such information in the form and context in which it appears.

 

 

 

If you would like

Nyota Minerals Limited

Suite 2, 5 Ord Street

West Perth WA 6005

T: +618 9324 2955

F: +618 9324 2977

tamara.bolik@nyotaminerals.com

www.nyotaminerals.com

 

 

Nyota Minerals Limited

EXPLORATEUR
CODE : NYO.AX
ISIN : AU000000DWY1
Suivi et investissement
Add to watch list Add to your portfolio Add or edit a note
Ajouter une alerte Ajouter aux Watchlists Ajouter au portefeuille Ajouter une note
ProfilIndicateurs
de Marché
VALEUR :
Projets & res.
Communiqués
de Presse
Rapport
annuel
RISQUE :
Profile actifs
Contactez la cie

Nyota Minerals est une société développant des projet miniers de nickel et d'or basée en Australie.

Nyota Minerals détient divers projets d'exploration au Burundi, en Afrique Du Sud et en Inde.

Ses principaux projets en exploration sont SWAZIGOLD au Swaziland, YORK PLATINUM et LAKE SONFON en Sierra Leone, TULU KAPI en Ethiopie, MUREMERA au Burundi, ZOET EN ZUUR et PYPKLIP en Afrique Du Sud et INDIAN en Inde.

Nyota Minerals est cotée au Royaume-Uni et en Australie. Sa capitalisation boursière aujourd'hui est 1,9 millions AU$ (1,4 millions US$, 1,3 millions €).

La valeur de son action a atteint son plus haut niveau récent le 27 juillet 2007 à 1,55 AU$, et son plus bas niveau récent le 14 novembre 2016 à 0,00 AU$.

Nyota Minerals possède 1 877 600 000 actions en circulation.

Votre avis nous interesse, merci de laisser un commentaire ou de noter cet article.
Evaluer : Note moyenne :0 (0 vote) Voir les mieux notés
 
Rapports annuels de Nyota Minerals Limited
Nyota Minerals provides update on status of annual report
Limted: 2008 Annual Report
Financements de Nyota Minerals Limited
11/02/2011IFC EXERCISES ALL NYOTA OPTIONS TO BECOME LARGEST SHAREHOLDE...
Nominations de Nyota Minerals Limited
14/07/2010ANNOUNCEMENT - APPOINTMENT OF MIRABAUD AS JOINT BROKER
14/05/2010ANNOUNCEMENT - NYOTA APPOINTS MR TERRY TUCKER AS CHIEF OPERA...
04/03/2010ANNOUNCEMENT - NYOTA APPOINTS OCEAN EQUITIES LTD AS JOINT BR...
04/01/2010ANNOUNCEMENT - APPOINTMENT OF EXECUTIVE DIRECTOR
16/10/2009ANNOUNCEMENT - APPOINTMENT OF EXECUTIVE DIRECTOR
Projets de Nyota Minerals Limited
11/12/2013Nyota Minerals: Sale of 75% in Tulu Kapi Subsidiary to KEFI ...
14/11/2013Nyota Minerals - Approval for the Renewal of Tulu Kapi Gold ...
04/04/2013Form 604 - Notice of change of interests of substantial hold...
01/03/2013Form 604 - Notice of change of interests of substantial hold...
28/02/2013Form 604 - Notice of change of interests of substantial hold...
25/06/2012Nyota Minerals (NYO.L) - Exploration drilling update at Tulu...
12/05/2011(Tulu Kapi)ANNOUNCEMENT - TULU KAPI DRILLING UPDATE
15/07/2010ANNOUNCEMENT - FEASIBILITY STUDY AND NEW APPOINTMENTS
06/10/2009(Tulu Kapi)Investors Report on the Tulu Kapi Gold Project
28/05/2009(Muremera)Muremera Project Phase 2 Update
20/08/2008Daguma Coal Project Engineering Pre-Feasibility Study Progre...
09/07/2008(Swazigold)Extension of Stage 1 of the SwaziGold Shareholders and Earn-...
26/06/2008(Muremera)Muremera Nickel Project Proceeds to Phase 2
24/04/2008(Muremera) PROGRESS AT MUREMERA NICKEL PROJECT ANNOUCEMENT
23/04/2008(Swazigold)SWAZIGOLD RESULTS UPDATE
Communiqués de Presse de Nyota Minerals Limited
13/10/2015Annual Corporate Governance Statement
29/09/2015Appendix 4G
29/09/2015Annual Report for the Period Ended 30 June 2015
24/09/2015Notification of Major Interest in Shares
14/09/2015Notification of Major Interest in Shares
27/07/2015Quarterly Report for the period ended 30 June 2015
16/07/2015Placement Completed and TVR
14/07/2015Ivrea Project: Exploration Targets Generated - REVISED
14/07/2015Ivrea Project: Exploration Targets Generated by Successful A...
09/07/2015Results of General Meeting
22/04/2015Ivrea Project: Second Exploration Permit Issued
20/02/2015Share Issue and Section 708A Notice
17/02/2015Change in Substantial Holding
16/02/2015Holdings in Company
12/02/2015Holdings in Company
12/02/2015Change in substantial holding
11/12/2014Corporate and Licence Update
10/12/2014Change in Nominated Adviser
19/11/2014Results of AGM
29/10/2014Quarterly Report for the period ended 30 September 2014
20/03/2014Share Issue and Directors APPENDIX 3Z
18/03/2014Correction to Result of AGM
05/02/2014Nyota Minerals - Final Results for the Year Ended 30 June 20...
31/01/2014Nyota Minerals Limited - Quarterly Report and Board Changes
30/12/2013Nyota Minerals - Completion of Sale of Majority Stake in Sub...
31/10/2013Nyota Minerals Limited - Quarterly Report
17/10/2013Nyota Minerals - Conclusion of Strategic Review, Secured Loa...
17/10/2013Nyota Minerals - Conclusion of Strategic Review, Secured Loa...
03/10/2013Nyota Minerals - Response to Recent Share Price Movement and...
29/04/2013QUARTERLY REPORT
27/03/2013Appendix 3Y - Change of Director's Interest Notice ( pdf 252...
21/02/2013Nyota Minerals - Raises =A34 million for Advancement of Tu =...
21/02/2013PLACING OF =A34=2E0 MILLION AND SHARE PURCHASE PLAN
21/02/2013Placing of GBP4.0 million and Share Purchase Plan ( pdf 246 ...
21/01/2013Nyota Minerals - Further High Grade Gold Mineralisation Inte...
17/01/2013Nyota Minerals - Ethiopian Ministry Confirms DFS Compliance ...
17/01/2013ETHIOPIAN MINISTRY CONFIRMS DFS COMPLIANCE AHEAD OF MINING L...
17/01/2013Ethiopian Ministry Confirms DFS Compliance Ahead of Mining L...
12/07/2012ANNOUNCEMENT - IFC SUBSCRIPTION COMPLETED - SECTION 708A NOT...
06/07/2012[AIM: NYO] Submission to the Ministry of Mines
21/03/2012New Chairman for Nyota - ex-Kalahari Minerals' Neil Maclachl...
03/02/2012Nyota Minerals Ltd - Successful share placing to raise =A39=...
23/08/2011Nyota (NYO.L) - Tulu Kapi Feeder Zone Drill Results and Dril...
13/05/2011(Tulu Kapi)ANNOUNCEMENT - LODGEMENT OF TULU KAPI MINING LICENCE APPLICA...
08/03/2011OCEAN EQUITIES SITE VISIT DEBRIEF
14/02/2011Alert* "Nyota Minerals says IFC exercises remaining options,...
15/06/2010ANNOUNCEMENT - EXERCISE OF OPTIONS OVER HIGHLY PROSPECTIVE A...
14/06/2010ANNOUNCEMENT - COMPLETION OF =A33=2E44 MILLION SUBSCRIPTION ...
28/05/2010ANNOUNCEMENT - FINAL AGREEMENTS SIGNED FOR IFC SUBSCRIPTION ...
15/04/2010"Nyota Minerals says World Bank's IFC set to invest =A33=2E4...
14/04/2010ANNOUNCEMENT - IFC INVESTMENT IN NYOTA
12/04/2010ANNOUNCEMENT - NYOTA SECURES OPTIONS OVER HIGHLY PROSPECTIVE...
22/03/2010ANNOUNCEMENT - BOARD CHANGES
16/03/2010ANNOUNCEMENT - HALF YEAR REPORT 31 DECEMBER 2009
22/02/2010ANNOUNCEMENT - RESULTS OF GENERAL MEETING
15/02/2010ANNOUNCEMENT - SHAREHOLDER LETTER
03/02/2010Tulu Kapi metallurgical test results
29/01/2010ANNOUNCEMENT - QUARTERLY REPORT 31 DECEMBER 2009
22/01/2010ANNOUNCEMENT - NOTICE OF MEETING OF SHAREHOLDERS
23/12/2009ANNOUNCEMENT - ISSUE OF OPTIONS TO EMPLOYEES AND CONSULTANTS
18/12/2009ANNOUNCEMENT - PLACING TO RAISE GBP2.25 MILLION
30/11/2009ANNOUNCEMENT - RESULTS OF ANNUAL GENERAL MEETING
13/11/2009ANNOUNCEMENT - UPDATED COMPANY PRESENTATION
10/11/2009RESOURCES EXPECTED TO INCREASE SIGNIFICANTLY AT ETHIOPIAN GO...
03/11/2009ANNOUNCEMENT - UPDATED COMPANY PRESENTATION
30/10/2009ANNOUNCEMENT - QUARTERLY REPORT 30 SEPTEMBER 2009
30/10/2009ANNOUNCEMENT - NOTICE OF ANNUAL GENERAL MEETING
29/10/2009AMBRIAN UPDATE OCTOBER 2009
13/08/2009Dwyka to secure 100% of Minerva - Offer closed
12/08/2009RESORUCES LIMITED ANNOUNCEMENT - MINERVA OFFER CLOSED, COMPU...
07/08/2009ANNOUNCEMENT - ISSUE OF SHARES
04/08/2009ANNOUNCEMENT - NOTICE OF MEETING
30/07/2009ANNOUNCEMENTS - ISSUE OF SHARES
29/07/2009Offer Update
23/07/2009Delisting of Minerva Resources
23/07/2009Issue of shares to accepting Minerva Resources Plc ('Minerva...
21/07/2009Issue of shares to accepting Minerva Resources Plc sharehold...
15/07/2009TAKEOVER OF MINERVA
09/06/2009Further announcement : Possible Offer for Minerva Resources ...
01/06/2009Possible Offer for Minerva
20/02/2009ANNOUNCEMENT - BOARD CHANGE
18/02/2009ANNOUNCEMENT - SHAREHOLDER LETTER
10/09/2008Drilling at Daguma off to a Positive Start
13/08/2008Drilling Commences at Daguma Coal Project
06/08/2008KimCor Diamonds plc Update
29/07/2008Quarterly Report for the period ended 30 June 2008
25/07/2008Sylvania Resources Limited (SLV): Quarterly Report to 30 Jun...
18/07/2008Drilling and Prefeasibility to commence at Daguma Coal Proje...
17/07/2008Exercise of Daguma Coal Project Option
09/07/2008Company Profile
01/07/2008Drilling Programme to Commence at Daguma Coal Project
30/05/2008NOTICE OF MEETING
30/05/2008AMBRIAN - DWYKA RESOURCES LIMITED - RATING RAISED - PHILIPPI...
30/05/2008DAGUMA COAL PROJECT - REVIEW OF HISTORIC DATA
28/05/2008SUCCESSFUL CAPITAL RAISING OF GBP10.3M (A$21.3M)
14/05/2008- AMBRIAN - DIVERSIFICATION - PORTFOLIO BUILDING
07/05/2008 OPTION TO ACQUIRE INTEREST IN PHILIPPINES COAL PROJECT
30/04/2008QUARTERLY REPORT 31 MARCH 2008
Publication de commentaires terminée
 
Dernier commentaire publié pour cet article
Soyez le premier à donner votre avis
Ajouter votre commentaire
AUSTRALIA (NYO.AX)
0,001+0.00%
AUSTRALIA
AU$ 0,001
14/11 02:57 -
0%
Cours préc. Ouverture
0,001 0,001
Bas haut
0,001 0,001
Année b/h Var. YTD
 -  -
52 sem. b/h var. 52 sem.
- -  0,001 -%
Volume var. 1 mois
4 600 000 -%
Produit
Développe
Recherche Cobalt - Copper - Diamonds - Gold - Nickel - Palladium - Platinum - Silver
 
 
 
Analyse
Interactive chart Add to compare
Graphique
interactif
Imprimer Comparer Exporter
Dernière mise à jour le : 01/12/2010
Vous devez être connecté pour accéder au portefeuille (gratuit)
Top Newsreleases
LES PLUS LUS
Variation annuelle
DateVariationMaxiMini
 
Graphique 5 ans
 
Graphique 3 mois
 
Graphique volume 3 mois
 
 
Nouvelles des Sociétés Minières
Plymouth Minerals LTDPLH.AX
Plymouth Minerals Intersects Further High Grade Potash in Drilling at Banio Potash Project - Plannin
0,12 AU$-8,00%Trend Power :
Santos(Ngas-Oil)STO.AX
announces expected non-cash impairment
7,70 AU$-0,65%Trend Power :
Oceana Gold(Au)OGC.AX
RELEASES NEW TECHNICAL REPORT FOR THE HAILE GOLD MINE
2,20 AU$+0,00%Trend Power :
Western Areas NL(Au-Ni-Pl)WSA.AX
Advance Notice - Full Year Results Conference Call
3,86 AU$+0,00%Trend Power :
Canadian Zinc(Ag-Au-Cu)CZN.TO
Reports Financial Results for Q2 and Provides Project Updates
0,12 CA$+4,55%Trend Power :
Stornoway Diamond(Gems-Au-Ur)SWY.TO
Second Quarter Results
0,02 CA$+100,00%Trend Power :
McEwen Mining(Cu-Le-Zn)MUX
TO ACQUIRE BLACK FOX FROM PRIMERO=C2=A0
12,26 US$+2,68%Trend Power :
Rentech(Coal-Ngas)RTK
Rentech Announces Results for Second Quarter 2017
0,20 US$-12,28%Trend Power :
KEFIKEFI.L
Reduced Funding Requirement
0,53 GBX-1,87%Trend Power :
Lupaka Gold Corp.LPK.V
Lupaka Gold Receives First Tranche Under Amended Invicta Financing Agreement
0,06 CA$+0,00%Trend Power :
Imperial(Ag-Au-Cu)III.TO
Closes Bridge Loan Financing
2,64 CA$-1,86%Trend Power :
Guyana Goldfields(Cu-Zn-Pa)GUY.TO
Reports Second Quarter 2017 Results and Maintains Production Guidance
1,84 CA$+0,00%Trend Power :
Lundin Mining(Ag-Au-Cu)LUN.TO
d Share Capital and Voting Rights for Lundin Mining
16,23 CA$+4,04%Trend Power :
Canarc Res.(Au)CCM.TO
Canarc Reports High Grade Gold in Surface Rock Samples at Fondaway Canyon, Nevada
0,24 CA$+4,26%Trend Power :
Havilah(Cu-Le-Zn)HAV.AX
Q A April 2017 Quarterly Report
0,20 AU$+2,63%Trend Power :
Uranium Res.(Ur)URRE
Commences Lithium Exploration Drilling at the Columbus Basin Project
6,80 US$-2,86%Trend Power :
Platinum Group Metals(Au-Cu-Gems)PTM.TO
Platinum Group Metals Ltd. Operational and Strategic Process ...
1,88 CA$+0,53%Trend Power :
Devon Energy(Ngas-Oil)DVN
Announces $340 Million of Non-Core Asset Sales
52,71 US$+0,19%Trend Power :
Precision Drilling(Oil)PD-UN.TO
Announces 2017Second Quarter Financial Results
8,66 CA$-0,35%Trend Power :
Terramin(Ag-Au-Cu)TZN.AX
2nd Quarter Report
0,04 AU$+5,56%Trend Power :