Modern Mining

In an operations update on its Gakara rare earth project in Burundi for the three months to 30 September 2018, London-listed Rainbow Rare Earths says that production measured in terms of exported concentrate increased 27 % compared with the previous quarter at 350 tonnes (275 tonnes in the quarter to 30 June 2018). Sales for the quarter were maintained at 350 tonnes and average grade increased to 59 % TREO (Total Rare Earth Oxide) from 55 % TREO in the previous quarter, and 58 % in the financial year to 30 June 2018.

Concentrate exports from Gakara up

Mining operations underway at Gasagwe in June this year.

A slight decline in rare earth prices (particularly the prices of neodymium and praseodymium) in the quarter led to a reduction of 3,6 % in the realised sales price, which fell from US$2 229 to US$2 147 per tonne. For reference, Rainbow’s indicative basket price fell 7 % from US$12,87/kg to US$11,91/kg during the quarter.

Improvements to the efficiency of the exportation process in the quarter resulted in lower transport, shipping and handling costs.

Production costs per exported tonne increased compared to the previous quarter, which reflected an increase in the scale of the mining fleet in particular, both at Gasagwe, where the rate of stripping was increased on the previous quarter to counter instances of geological inconsistency, and at the new site, Murambi, where preparatory work had to be undertaken in advance of first production in the coming quarter, and was expensed rather than capitalised. As production levels increase, average costs per tonne are expected to decrease due to a large proportion of monthly costs being relatively fixed in nature.

Production from the Gasagwe pit has delivered at lower rates in recent months than had been initially anticipated. Vein structures have proven unpredictable both in terms of formation and thickness, which has led to variability in the provision of run of mine ore to the plant, as well as in terms of the dilution of plant feedstock.

In order to counter this, fleet size and stripping rates have been increased at the Gasagwe pit, which is intended to expose more vein material and allow for more predictable tonnages of ore going forwards.

Good progress has been made in developing the second mining area at Murambi. During the period, extensive trenching revealed a number of parallel and sub-parallel veins, in a stockwork formation similar in nature to Gasagwe. The cutting of an access road was completed during August, allowing mechanical equipment to be brought to the site, greatly increasing the stripping capacity. Murambi is now firmly on track to provide an additional source of ore to the Kabezi plant during Q2 (the three months to 31 December 2018) as planned.

Initial processing of bulk samples of Murambi ore indicated lower yields (fewer tonnes of concentrate produced per tonne of ore feedstock) than at Gasagwe. Early analysis suggests this may be due to the weathered nature of the ore tested, which is expected to improve as mining progresses into fresher material. If yields remain low, then greater quantities of run of mine ore tonnes will be required to achieve targeted production levels.

Given the imminent commencement of full mining production at Murambi and current uncertainty over the likely average concentrate yields as well as the unpredictable nature of the Gakara project’s vein stockwork deposits as reflected by recent experience at Gasagwe, the attainment of the target run-rate of 400 tonnes of concentrate per month (equivalent to 5 000 tonnes per annum) is now expected to be delayed into calendar year 2019. The precise date at which this will be achieved will depend on the progress of Murambi, as well as the 1-2 additional mining areas which Rainbow intends to bring on line in the next six to nine months.

Production guidance for the full year to June 2019 will be updated in early 2019 following a more representative period of operations from Murambi.

The company expects to be generating positive EBITDA when concentrate production and sales reach 250-300 tonnes per month and remains focused on utilising its existing cash and financing resources to reach that point.

Photo courtesy of Rainbow.

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