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In regions where the lithology has undergone more than one transpression event, quartz accumulated in the fold hinges to form saddle reefs. Disseminated or stratabound deposits are situated near an itabitritic horizon a few tens of meters thick, and belong to a volcano-sedimentary series of great extent.

The common characteristic of these deposits is the lack of quartz veins as exclusive ore bodies i. Exploration by Loncor commenced in late and initially included desktop research, primarily utilising data from the Royal Museum for Central Africa in Terveuren, Belgium and preliminary interpretation of airborne geophysical data, acquired by Rio Tinto in , and a three day reconnaissance site visit in December A base camp was established on the property in March , and exploration has continued uninterrupted since then.

The work to date has involved two phases run in parallel Diamond drilling has been carried out on all three of these prospects; and. Anguluka and the Imva Fold will be the focus of exploration in The Tervuren database provided information regarding areas of historical mining and prospecting, past-production estimates and limited data on local geology and mineralization styles. Table 7 summarises the information acquired on the main historical prospects.

Information regarding historical production, gold estimate indications and mineralization style was extracted from the database. Table 7: Deposit Information from the Terveuren Database. An airborne magnetic and radiometric survey was flown over a large portion of the Ngayu Project area by New Resolution Geophysics in July and August The survey parameters are shown in Table 8. The DTM, illustrated in Figure 7, shows a gently rolling relief over most of the property with higher ground tending to form strike-parallel ridges coincident with the more resistant BIF units, particularly to the northeast of the area.

The relatively low lying terrain in the southwest is underlain by the Lindian lithologies. Measuring the abundance of these elements gives an indication of the content of these elements in the bedrock. The typical contents of these elements in various rock types are known, thereby providing a tool for postulating the type of source rock.

The results of the radiometric survey are presented in Figure 8. This figure shows a ternary image of the combined K, U and Th data. The radiometric data have proved highly effective in mapping the major geological units in the area, and have been incorporated into the integrated geophysical interpretation described in more detail below. Geological units which are clearly defined include mafic volcanics, granitoid basement and intrusive, and Lindian sediments and recent alluvium.

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An example of one of the many aeromagnetic images generated for the Ngayu area is presented in Figure 9, and shows the analytical signal of the magnetics. Of prominence in this image is the high magnetic intensity BIF, which is an important chemical and structural host for gold mineralization, as discussed in previous sections of this report. All airborne geophysical data have been analysed in detail by specialist geophysicists employed by Newmont in Perth, Australia.

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The objectives of the interpretation were to prepare a map showing the distribution and structural relationships of the different lithologies in the project area, and to identify and prioritise target areas for gold mineralization. Figure 10 shows the results of the Newmont interpretation. Four areas have been prioritised as being lithologically and structurally favourable for gold mineralization, and are as follows BLEG sampling is a stream sediment sampling technique employed by Newmont worldwide in their regional gold exploration programmes.

It provides a relatively fast and reliable way of assessing large tracts of land, and has been particularly effective in defining targets within the Ngayu area. The sampling methodology and analytical techniques are proprietary to Newmont, and as such, cannot be detailed in this report. Following successful orientation surveys in the Yindi and Makapela areas in , in which 32 samples were collected, three phases of BLEG sampling were carried out as follows The results for Phases 1 and 2 are shown in Figure The rationale for selecting these targets is as follows It was concluded that the quality of the sampling was excellent, and that the results of the survey are reliable.

Groundwork aimed at defining drilling sites within the above target areas commenced in January In addition, the programme provides for geophysical surveys to more closely define the location of potentially mineralized zones. Soil sampling grids have been established at the Yindi, Makapela and Itali prospects, and regional soil sampling traverses have been carried out over the Imva Fold Area.

A total of 10, soil samples have been collected at Ngayu to date as shown in Table 9. Table 9: Exploration Summary for Ngayu Project. The Yindi grid in Figure 12 covers an area of Infill lines at 80m spacing were subsequently sampled in anomalous areas. A total of 2, samples were collected and analysed for gold. The results show a well-defined, strike-parallel anomaly defined over an area of 3 x 0.

Together with the results of rock chip sampling and channel sampling, the soil data were used to plan auger drilling and diamond drilling programmes, as detailed in Section 9. The Makapela grid in Figure 13 covers an area of A total of 4, samples were analysed for gold. Values above ppb Au occur over a strike of 3km from the area of the Main pit to north of Sele Sele Figure A separate anomaly occurs in the Bamako area, with a strike of approximately 2km.

Together with rock chip and channel sampling, the soil anomaly has been used to plan auger and diamond drilling as detailed below. The Itali grid is 2 x 1km in extent, and was sampled on x 40m spacing. A total of samples were analysed for gold. As shown in Figure In order to obtain a preliminary assessment of the geology and soil geochemistry of the Imva Fold Area to complement the regional BLEG sampling, a series of 1.

Three areas of anomalous soil values were identified, which are coincident with BLEG anomalies. Systematic detailed work commenced in these areas in January , with the objective of defining drilling targets by the middle of the year. A total of samples have been collected to date in on m spaced lines. Mapping and systematic field reconnaissance for Ngayu commenced in March and is ongoing. Due to the forest cover and deep tropical weathering, natural exposures are generally poor and infrequent. Most of the mapping data has been obtained from old workings and artisanal mining sites. Loncor uses standard logging forms to record lithological information rock name, colour, fabric, grain size, oxidation and hydrothermal alteration and structural information strike and dips of planar structures and direction and plunge of linear features.

Mapping is systematically carried out along all soil sampling lines at a scale of ,, and this information is combined with subsequent auger drilling and diamond drilling data to provide prospect-scale geological maps for Yindi, Makapela and Itali. Rock chip samples are routinely taken for gold analysis during geological mapping, with a focus on samples showing evidence of hydrothermal alteration. The assay data are used in conjunction with soil sampling results when prioritising areas for follow-up trenching, augering and diamond drilling. A total of rock chip samples have been taken to date, both within the grid areas discussed in above and elsewhere on the property during reconnaissance mapping.

Channel sampling has been carried out in old adits samples , trenches 1, samples and colonial and artisanal open-pit workings 1, samples. Channel sampling enables the widths and average grades of mineralization to be calculated, and provides a more reliable assessment of the mineralization potential than rock chip sampling.

Channel sampling was of particular importance at Makapela by confirming the potential for high grade quartz vein mineralization and guiding the preliminary diamond drilling programme as in Figure Diamond drilling commenced at Yindi in September , with the objective of following up soil and rock chip anomalies and testing the down-dip continuity of channel sampling intersections in old open pits and near-surface adits.

A total of 18 drill holes with a length of 3,m were completed over a strike of 1. The drilled rocks mainly comprise fine grained schists, which petrographic studies show were originally pellitic sediments and tuffs, now metamorphosed to lower greenschist facies. Several units of BIF up to about 15m in thickness are interlayered with the schists. Typical cross sections are shown in Figure 17 and all significant mineralized intersections are shown in Figure In these holes the mineralization associated with the main BIF horizon has an average width of Exploration at Makapela is focusing on a quartz vein system within a sequence of basalts, thin units of banded iron formation, and dolerite sills.

Porphyry dykes and sills of quartz-diorite to tonalitic composition are also present. The veins, or reefs, are being exploited by artisanal miners in three large pits Main, North and Sele Sele which are each between m and m in length, located along a strike of 2. The soil geochemical results indicate that the mineralization continues between these three artisanal workings under a thick soil cover. Diamond drilling commenced at Makapela in November , and is ongoing. A total of 60 drill holes have been completed to date, totalling 14,m.

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Drilling has been focussed in the following two areas. Two main veins have been identified in this area Figure Reef 1 has been intersected on the Main pit trend over a potential strike length of m down to a maximum vertical depth of m open at depth and along strike. The average true width of Reef 1 intersected in the 15 holes drilled to date is 1. Reef 1 tends to have a glassy, white massive texture and pyrite is much less common than in Reef 2.

The vein is hosted by basalt and dolerite, crosscuts the lithologic strike and is possibly a splay off Reef 2. Reef 2 has been intersected on the North pit trend over a strike length of m, the most significant grades occurring in the northern section over a potential strike length of m. In this northern area, which has so far been drilled by 18 holes to a maximum vertical depth of m, the mineralization has an average true width of 3.

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Reef 2 has a smokey grey, brecciated texture with common disseminations and stringers of pyrite and local pyrrhotite. The vein appears to have followed a shear zone within and on the margins of a m thick unit of banded iron formation, and is parallel to the lithological strike.

All mineralized intersections are summarised in Figure 19 and drill hole cross-sections are presented in Appendix 4. Approximately 2,m to the north of the North pit, the probable continuation of Reef 2 at the Sele Sele pit has been intersected by diamond drilling over a potential strike length of m Figure The mineralization is generally wider, but lower grade than on the North pit trend.