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Namibia
Etango Project

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 Location:
40 km NE from Walvis Bay, Namibia

  Project Contacts:
PO Box 1973
Subiaco
Western Australia, Australia
6904
Phone  ...  Subscription required
Fax+61 8 9381 1068
WebsiteWeb
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Overview

StageFeasibility
Mine TypeOpen Pit
Commodities
  • Uranium
Mining Method
  • Truck & Shovel / Loader
Processing
  • Sulfuric acid (reagent)
  • Heap leach
  • Solvent Extraction & Electrowinning
Mine Life16 years (as of Jan 1, 2015)


Owners

 
CompanyInterestOwnership
Bannerman Resources Ltd. 100 % Direct

Deposit Type

  • Breccia pipe / Stockwork


Summary:

Primary uranium mineralisation is related to uraniferous leucogranites, locally referred to as alaskites. These are often sheet-like, and occur both as cross-cutting dykes and as bedding and/or foliation-parallel sills, which can amalgamate to form larger, composite granite plutons or granite stockworks, made up of closely-spaced dykes and sills. These alaskite intrusions can be in the form of thin (cm-wide) stringers or thick bodies up to 200m in width.

The alaskite bodies have intruded into the metasediments of the Nosib and Swakop Groups of the Neoproterozoic (pre-550Ma) to early Palaeozoic (c500Ma) Damara Supergroup. These metasediments and alaskite intrusions flank the Palmenhorst Dome, which is cored by Mesoproterozoic (1.7-2.0Ga) gneisses, intrusive rocks and meta-sediments of the Abbabis Metamorphic Complex.

During the Damara Orogenic event, the metasedimentary cover was subjected to multiple phases of deformation, resulting in overturning of the succession and development of a prominent gneissosity and lineation which is generally sub concordant with original bedding. This gneissosity was further deformed leading to the formation of elongate basement-cored domes. Uraniferous alaskite sills and bodies that wrap around the Palmenhorst Dome are confined to dilatational sites in high-strain zones, with the alaskite sills generally striking from north northwest to north-northeast and dipping to the west.

The localised geological setting is depicted in, and the uranium occurrences at the contiguous Anomaly A, Oshiveli and Onkelo Prospects can be seen to wrap around the western edge of the Palmenhorst Dome. Uranium mineralisation occurs almost exclusively in the alaskite, although minor uranium mineralisation can be found in metasediments close to the alaskite contacts, probably from metasomatic alteration and in minor thin alaskite stringers within the metasediments.

The primary uranium mineralisation occurs as microscopic disseminations throughout the alaskite, at crystal interfaces, and as inclusion
within other minerals. Secondary uranium minerals such as coffinite (U(SiO4)(OH)4) and betauranophane (Ca(UO2)2(SiO3OH)2 5H2O) occur as replacements of the primary minerals or as coatings along fractures. QEMSCAN analysis indicates that about 81% of the uranium present is in primary uraninite, while 13% is in secondary coffinite and 5% is in secondary betauranophane


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mining method preferred for the Etango open pit will be a high tonnage (100Mtpa), low cost, traditional open pit truck and backhoe operation employing 550t diesel hydraulic excavators, off road 220t haul trucks and 203mm down the hole (DTH) hammer diesel drills.

The pit will be mined in a series of cutbacks to deliver 20Mtpa of ore to the heap leach operation and lower the amount of waste movement required during the early years of the project. Selective mining for the Etango Project consists of drilling and blasting on a 12m bench, with loading out in three flitches of equal height, which will nominally be 4.5m high, after allowing for swell from blasting. The mining selectivity recommended should minimise ore loss and dilution but, at the same time, allow the 100Mtpa mining rate to be achieved cost efficiently. There is also a clear advantage from a safety point ofview for loading in 4.5m flitch heights.


Crushing and Grinding


Processing

  • Sulfuric acid (reagent)
  • Heap leach
  • Solvent Extraction & Electrowinning

Source: Subscription required

Summary:

The process flowsheet (Figure 1.2) comprises a crushing circuit, reusable (on-off) heap leach pad for sulphuric acid leaching of the ore, and a uranium SX and recovery circuit to produce U3O8 yellowcake.

The ore is stacked in modules (52 in total), where each module represents one day of stacking. The first three modules are designed for stacking, ore rest and dripper installation. The next 15 modules are irrigated with intermediate leach solution (ILS). The liquor from these modules produces the PLS, which is pumped to the SX circuit for uranium recovery. The subsequent 15 modules are irrigated with raffinate solution, which drains to the ILS pond and is recirculated to the heap to build up uranium tenor. Thereafter there are 12 modules for draining and rinsing. Solution from these modules is recirculated to the rinse modules and also to the ILS and raffinate as water make-up. The remaining modules are spares and used for dripper removal and reclaiming.

PLS is ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Uranium (U3O8) Recovery Rate, %  ......  Subscription required
Uranium (U3O8) Head Grade, g/t 195
Subscription required - Subscription is required.

Projected Production:

CommodityUnitsAvg. AnnualLOM
Uranium (U3O8) M lbs 7.2113
All production numbers are expressed as U3O8.

Operational Metrics:

Metrics
Stripping / waste ratio 2.78 *
Ore tonnes mined, LOM 303 Mt *
Annual processing rate 20 Mt *
* According to 2015 study.

Reserves at December 31, 2015:

CategoryTonnage CommodityGradeContained 
Commodity
Measured 33.7 Mt Uranium (U3O8) 194 g/t 6,500 t
Indicated 362 Mt Uranium (U3O8) 188 g/t 68,100 t
Measured & Indicated 395.7 Mt Uranium (U3O8) 189 g/t 74,600 t
Inferred 144.5 Mt Uranium (U3O8) 196 g/t 28,300 t

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Uranium (U3O8) USD 38 / oz *
Assumed price Uranium (U3O8) USD 75 / oz *
* According to 2015 study / presentation.

Operating Costs:

Units2015
OP mining costs ($/t mined) USD 6.38 *
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2015 study.
Subscription required - Subscription is required.

2015 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 321.4
Net revenue (LOM) $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 26, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 26, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Project Description 2015
Technical Report 2015
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Aerial view:

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