Uranium was first discovered by Turkey’s Uranium Division of the Department of Energy, Raw Material and Exploration (MTA) in the early 1980s. MTA continued to explore the region for the next 10 years.
Following a change to the Turkish Mining Law in 2004 the private sector has been able to explore for radioactive substances.
The Temrezli Project is wholly owned and operated by Uranium Resources (URI) through its merger with Anatolia Energy, which was completed in November 2015. Anatolia Energy through its subsidiary Adur, commenced exploration at the Temrezli Project in 2010 and confirmed the MTA’s findings.
Landowners, the local community and the local municipality of Sorgun have been supportive of our current and planned exploration activities at Temrezli.
The granite basement does not outcrop in the immediate area but is intersected by drilling at depths between 20m and +200m. Immediately overlying the basement and part in-filling the paleo-topographic basement depressions is a thin basal conglomerate. This is overlain by interbedded layers of varying thicknesses of sandstone, both coarse and fine, mudstone and siltstone. The mudstone can contain plant fossils and lignite bands. Submarine volcanism as andesite, basalt, tuff or agglomerate is interbedded within the upper sedimentary units. The units are interpreted on plan and cross-section to be affected by mild flexural folding (warping).
Aerial volcanics including andesite and basalt with white limestone, pebbly at its base and fining upwards, is locally developed whilst wind-blown sand can accumulate as surface drifts.
Regional airborne radiometric surveys commenced as early as 1958. These were mostly peripheral to or at some distance from the project area. Ground exploration, sometimes quite detailed, continued sporadically into the early 1960s.
While a number of uranium anomalies and mineralization were discovered, the tenor of the mineralization was not considered significant and the area was abandoned for most of the 1970s.
In 1980 a review of the earlier work was undertaken by the Uranium Division of the Department of Energy, Raw Material and Exploration (MTA). It concluded that the district might have important uranium occurrences and the Uranium Division commenced exploration in 1980. Their work quickly discovered a number of uranium anomalies which provided sufficient early positive results to ensure exploration continued for most of the next decade.
Throughout the 1980s exploration consisted of:
- diamond and rotary drilling;
- gamma and electrical logging of the bore holes;
- topographical and geological mapping;
- chemical and petrographic sampling of core material; and
- leach test work of selected material.
While the uranium mineralization was not mineralogically identified, alkaline and acid leach tests, with recoveries of over 80% and 90% respectively from crushed core samples, clearly demonstrated that the uranium mineralization is in a “free” state and in the form of distinct secondary mineral species (i.e. not in a refractory form or absorptively bound on clay or carbon). Thus it appears suitable for recovery using ISL methodology.
The 1989 MTA reserve report for the Temrezli uranium occurrence outlined a range of resource estimates using a number of methodologies with lower cut off grades applied to the calculated eU3O8 grades. These estimates were compiled by competent geoscientists using the best estimation tools available at the time. Given MTA’s reported resource estimates assumed an open pit model including a lower cut-off grade of 0.03% (300ppm) eU3O8, these estimates would not be entirely appropriate for the planned ISL extraction methods nor compliant with the JORC Code for reporting mineral resources and ore reserves.
The MTA database has been re-documented, checked for both accuracy and reliability, and uploaded into an electronic relational database. The various reports sourced from Government, commercial and private sources have been found to be of acceptable quality and reliability.
Anatolia Energy, through Adur, conducted exploration drilling, mostly twinning the earlier MTA holes but also in-fill and step-out holes, confirmed the work of the 1980s and extended the uranium mineralization to the northeast over a strike length of +3,000m.
The uranium mineralization is considered to be epigenetic and related to strata controlled redox boundaries influenced by permeability changes and/or stratabound reductants such as organic material or iron sulfides.
The drilling has identified a number of sub horizontal stacked lenses of which over 73% of the total resource is contained within 4 lenses, and over 51% within lens 1 and 2. Uranium grades range from less than the detection limit for barren material lying adjacent to the mineralization to a best intercept to date of 18.2m at 1,424ppm eU3O8 from 108.0m in TUR 61.
A JORC-compliant Mineral Resource estimate prepared by CSA Global Pty Ltd (2014) was based upon equivalent uranium assay data from the recent drilling of 94 bore holes (58 infill/step-out diamond and 36 rotary tri-cone), and 385 boreholes from the 480 bore holes drilled by the MTA (34 diamond and 446 RC drill holes).