Strandline Launches Major Exploration Campaign in Tanzania
Strandline Resources (ASX:STA) has defined an Exploration Target for the Tajiri Mineralised Corridor in the Tanga North mineral sands project in Tanzania of 100-270Mt at 3-5% Total Heavy Minerals (THM), exclusive of current Resources of 59Mt at 3.7% THM. The Exploration Target is comparable to resources defined by other producers in the area.
- The Company is now funded and preparing for 6 month drilling and geophysical campaign to grow existing high grade resources and seek additional high value discoveries.
- Tajiri Drilling – Resource extension drilling between and along strike from the high grade deposits already defined within the 20km long Tajiri Mineralised Corridor;
- Tongani and Pangani Drilling – Maiden drilling campaign targeting additional high grade discoveries at Tongani and Pangani Prospects;
- Tanga North – Initial drilling programme to test for large rutile-rich mineral sands, and
- Detailed Aeromagnetic Survey over key prospective areas to delineate new targets.
Strandline Managing Director, Tom Eadie commented, “Following on from our recently announced funding partnership with Tembo Capital, the Company now enters a very active phase beginning with an aggressive exploration and resource building campaign.
“This campaign will focus on delivering high value heavy mineral projects capable of economic development, even in low commodity environments. We look forward to reporting a series of exciting results over the coming six to twelve months.
“The Exploration Target defined in this report represents our goal for the remainder of the year. The quantum and grade of the Exploration Target is comparable to resources defined at nearby operating mines, giving us confidence we are heading in the right direction.”
Planned Exploration Activities
With funding now in place, the Company is well positioned to execute its 2016 exploration program in Tanzania. Our exploration team is mobilising the necessary expertise and equipment, and are preparing for the start of a busy field season. Initial activities will comprise:
1. Resource Extension Aircore (AC) drilling activities will commence at the Tajiri project where the Company has already defined an Indicated Resource of 59Mt @ 3.7% THM for 2.2Mt of contained HM (see ASX announcement, 4 April 2016).
The program will be focussed on firstly extending mineralisation from the current Tajiri North and Tajiri Resources.
In addition, a number of other targets have been defined using the Company’s large database along strike of the known mineralisation and these will also be tested this upcoming drill program. A total of 4,000 to 5,000m of AC drilling is planned for these programs.
2. Maiden AC drilling programs will also be undertaken at the Tongani and Pangani prospects within the Tanga South Project. Historical surface geochemistry and detailed aerial magnetic/radiometric data has been compiled to generate priority targets for AC drill testing. A systematic grid based drill program has been designed to provide coverage over the majority of the tenure with closer spaced drill patterns targeting the priority targets. A total of 5,000m is planned for this program.
3. At Tanga North, there are large dune systems containing huge volumes of sand. Previous sampling has indicated that the amount of rutile, as a percentage of the heavy mineral concentrate, is unusually high at about 17% rutile plus about 6% zircon. A first pass drilling programme of about 1,500m is planned to search for areas of high concentrations of this very favourable assemblage.
4. Detailed aeromagnetic survey extending across all prospective tenements (aside from Tanga South, which has already been flown) using flight lines varying from 100m to 200m apart and a flight height of 30m. A total of approximately 20,000 line km have been planned for this extensive aerial magnetic, radiometric and topographic survey. The technique was very successful at Tanga South in delineating zones of heavy minerals forming coherent targets.
Tajiri Mineralised Corridor Exploration Target
With the completion of the initial AC drilling programs at the Tajiri prospects late last year, the Company has been able to determine an Exploration Target estimate of the exploration potential for the remainder of the undrilled portion of the 20km long mineralised corridor. The Exploration Target is an estimate of potential where there has been insufficient exploration for Mineral Resource Estimation.
The Company has defined an Exploration Target of 100 to 270Mt at 3% to 5% Total Heavy Minerals (THM), not including the current Indicated Resources of 59Mt @ 3.7% HM already identified in this corridor.
Strandline would caution the reader that the potential quantity and grade of the combined Exploration Target is conceptual in nature and there has been insufficient exploration to define a JORC Compliant Mineral Resource. It is also uncertain if further exploration and resource development work will result in the determination of a Mineral Resource.
The Exploration Target has been determined based on the following previous exploration data:
- Extensive auger and AC drill database for width, depth and grade ranges;
- The grades were determined using traditional heavy media separation and visual estimates from field logging;
- Widespread geochemical sampling forming coherent surface anomalies which have been since drill tested and known to overlie heavy sand mineralisation;
- A combination of the magnetic and radiometric anomalies generated from processing detailed (100m flight line and 30m sensor height) aeromagnetic data;
- Topographic features using a detailed digital terrain model generated from the aeromagnetic survey;
- Bulk density value of 1.7 derived from the average values used for the Indicated Resources at Tajiri and Tajiri North; and
- Grade ranges used for the Exploration Target are based on the actual resource grades estimated for the Indicated Resources at Tajiri and Tajiri North, which show two styles of mineralisation for the area. Using a 1.7% THM cut-off, the resource grade at Tajiri North is 3%, whilst at Tajiri the resource grade is 5.1%. The resource grade ranges of Tajiri and Tajiri North approximate the grade ranges that are expected for this region and are considered appropriate to use for this Exploration Target.
Zones (1 to 5) for the Exploration Targets were generated in GIS software integrating the above datasets. The surface areas were calculated and multiplied by the average bulk density used for the Indicated Resource estimate completed at the Tajiri and Tajiri North prospects. The outlines were then multiplied by the depth ranges as defined by auger and AC drilling in the various zones. The mineralisation is assumed to be defined from surface. The results are presented in Table 1 and the locations and data distribution is presented in Figure 3.
In summary, the Tajiri Mineralised Corridor Exploration Target is 100 to 270Mt at 3% to 5% Total Heavy Minerals (THM), not including the current Indicated Resources of 59Mt @ 3.7% HM already identified in this corridor.
As outlined above, the Company will be undertaking 4,000 to 5,000m of AC drilling across these Exploration Targets to test their validity. The drilling will be utilising 400 to 1,600m spaced drill lines with drill holes located every 200m along the lines. The program will be undertaken over the next 6 months.
The Exploration Target defined in Table 1 is in addition to the Indicated Resources for the Tajiri Prospects previously announced and presented in Table 2 (announced 4th April 2016).