Ditau comprises of two prospecting licenses (PL169/2012 and PL010/2019), which cover an area of 1,386km2. Surface prospecting work by Kavango has involved geochemical soil sampling and magnetic and gravity geophysical surveys. Analysis of results from this work, and pre-existing airborne magnetic geophysics data, has enabled the identification of 10 separate magnetic “ring structures” within the Ditau license area.
One of these ring structures is a 7km by 5km magnetic and gravity anomaly (the “Ditau Prospect”). In Q1 2019 Kavango conducted an initial 1,000m diamond drill programme at the Ditau Prospect across two holes, 1.8km apart.
Drill core assay and whole rock geochemistry results from the two holes were released in August 2019 and whilst they did not identify economic mineralization, the results confirmed the presence of highly altered Karoo sediments, sitting above a mafic intrusive body. The alteration observed in the drill cores stretched to >300m depth.
These results were considered encouraging because the age of the Karoo rocks (c.120million years), the high level of their alteration and the fact this alteration stretched to >300m depth; valuable geological pointers, when exploring for potentially economic mineral deposits.
Further, the geochemistry obtained from the drill core of the two Ditau Prospect holes suggested the metasomatic alteration encountered was due to a process known as fenite alteration or “fenitization”. Fenite alteration is particularly associated with carbonatite intrusions, where it occurs as an aureole or halos around the carbonatite intrusive, and it has significant potential to be used as an exploration tool to find mineralised intrusions in a similar way alteration patterns are used in other ore systems, such as porphyry copper deposits.
Carbonatites and alkaline-silicate rocks are the most important sources of Rare Earth Elements and niobium. REEs include much sought after elements, such as Neodymium and Praseodymium, which are used in the manufacture of the new generation of electric vehicles (EVs) and other high-tech applications.
By way of comparison, Kavango consider the post-Karoo age of the fenitized rocks intersected by drilling at the Ditau Prospect, is comparable to the post-Karoo at the Longonjo carbonatite which is being developed as a neodymium and praseodymium open pit mine, by Pensana Metals Limited in Angola.
Subsequent to the release of the August 2019 drill results from Ditau, Kavango learned that Canadian miner Falconbridge Limited (“Falconbridge”) drilled into 3 carbonatites (the “Falconbridge Carbonatites”) in the early 1970s at a location less than 50km from Ditau and hosted by similar Karoo country rocks.
Falconbridge was looking for kimberlites in this area, which lies within a cluster of over 20 kimberlites discovered at the same time. Kimberlites, otherwise known as “diamond pipes”, are the most important source of diamonds mined today. However, carbonatites have similar looking magnetic and gravity anomalies to these diamond-bearing formations.
The carbonatites that Falconbridge intersected were just below the Kalahari sand cover and therefore would have been amenable to open pit mining. This implies they are post-Karoo age and therefore potentially comparable to the Ditau ring structures.
Although the Falconbridge Carbonatites are located outside of the Kavango held ground the company is reviewing the Falconbridge results and designing an orientation study to assist in the characterisation and exploration vectoring for the Ditau ring-structures. As part of this orientation study the Falconbridge Carbonatites will be surveyed using ground magnetic and gravity geophysics and soil geochemistry.
The KCB stretches 1,000 km from northern Botswana to central Namibia and is prospective for copper-silver deposits. The KCB is relatively underexplored and is a key emerging trend globally, located in stable and pro-mining jurisdictions.
In recent years the KCB has attracted substantial exploration interest. This has resulted in significant copper-silver discoveries including:
Prior to applying for any Prospecting Licenses ("PLs"), Kavango undertakes extensive desktop and due diligence studies. In addition, Kavango analyses publicly available exploration data to enhance its geological and geophysical understanding of the area.
Kavango was granted two PLs, in April 2020 and which lie in a highly prospective area immediately south of the District capital of Ghanzi. The PLs covering a total of 1,294.2 km2 are as follows:
The JV plan to commence field work on the two KCB licenses shortly and will likely comprise both regional and detailed soil geochemistry. Planned work also includes a ground magnetic survey to refine the positions of the prospective geological contacts, below Kalahari sand cover, with the option of follow-on electromagnetic survey work to identify potential conductors associated with those contacts. Controlled-source audio-frequency magnetotellurics (“CSAMT”) surveying will be carried out over soil anomalies to define the stratigraphy, structures and mineralisation.
Drilling is planned by the JV partners when suitable targets have been identified.
Project: Botswana Joint Venture
Target metals: Copper and Rare Earth Elements (REEs)
Seeking to secure a major metal discovery under sand cover by applying latest technology to identify large scale targets for early drilling
The JV plan to commence field work on the two KCB licenses and will comprise both regional and detailed soil geochemistry. Desktop reviews continue at Ditau Camp Project to identify drill ready targets.
6 January 2021