Lilltrask Project, Sweden

A highly prospective area left almost completely unexplored.

Boss Resources limited is pleased to announce that it has been granted the Lilltrask Ni/Cu Project in Northern Sweden. Encouraged by the results of the Company’s first exploration drilling in Scandinavia (20.3m @ 0.3% Ni and 0.2% Cu at the Skogtrask project in Sweden, ASX: 28 August 2014), the Company has aggressively pursued its program for the identification of new exploration targets in northern Scandinavia.

A new occurrence of Ni-Cu sulphides has been identified by Boss and an application for three exploration licenses over the prospective area has been submitted (Fig. 1). The three adjoining licenses cover an area of approximately 14.9 km2 and are located in the Lilltrask area in northern Sweden approximately 35 km from Lulea, the regional administrative and industrial centre on the coast of the Gulf of Bothnia (Fig. 1). Two other Boss projects, Nottrask and Skogtrask, are also located in the same province.

The Lilltrask Project is located approximately 35 km from the nearby deep water port in Lulea, the administrative and industrial centre in the region (Fig. 1). It is easily accessible year round by bitumen road running through the licenses.

The Lilltrask area is highly prospective and it has been left almost completely unexplored. This is a rare situation and it represents an excellent window of exploration opportunity for Boss. The geological characteristics of the project including the outcropping Ni-Cu sulphides coincident with the aeromagnetic anomalies allow us to fast track Boss’ exploration program over the next few months from conceptual model, ground eletromagnetics to a drilling stage.” – Dr Marat Abzalov, Executive Director – Geology

Project Geology

The Project area is characterised by the presence of norites and gabbro-norites containing disseminated Ni-Cu sulphides. The mafic rocks bearing Ni-Cu mineralisation were found in the boulders and also in one small outcrop located approximately 500m from the bitumen road passing through the licenses (Fig. 2).

Figure 2. Outcrop of norites containing disseminated Ni-Cu sulphides (denoted as S) in the Lilltrask area

Assay results have confirmed the outcropping Ni grades are up to 0.6% and Cu grades up to 0.8%. Sulphides are characterised by high metal tenors, with Ni tenor up to 4% and Cu tenor exceeding 7% (Table 1).


Table 1: Assays of the samples collected from the outcrops at the Lilltrask prospect


This find accords well with the airborne magnetic data showing presence of a strong magnetic anomaly at Lilltrask (Fig. 3a). The shape and intensity of the magnetic anomaly indicate the presence of a mafic-ultramafic intrusion (Fig. 3a).

Figure 3. Map of the Lilltrask Project: (a) airmagnetic data

Despite the outcrop of the norites containing disseminated Ni-Cu sulphides, the intrusions were not geologically mapped correctly and are not currently shown on the geological maps published by the Swedish Geological Survey (Fig. 3b).

Figure 3. Map of the Lilltrask Project: (b) geological map downloaded from the Swedish Geological Survey

This clearly shows that the area is poorly studied and significantly underexplored. Modern electro-magnetic geophysical technologies have not been used in the area for delineating the sulphide mineralisation. Magnetic anomalies have not been investigated and mafic-ultramafic intrusions have never been drilled.

Based on interpretation of the airborne magnetic data (Fig. 3a) by Boss geologists, it is suggested the Lilltrask Project contains groups of the mafic-ultramafic intrusions characterised by irregular shapes and in general elongated in the north – western direction which is coincident with orientation of the regional faults (Fig. 4).

Figure 4. Generalised geological map of the Lilltrask area proposed by Boss geologists.

Intrusions, according to aeromagnetic data, vary from 300m x 50m to 5400m x 400-1200m (Fig. 4). The main exploration interest is ‘Intrusion 2’ which is narrow sill-like body, 2000m x 300m, which is likely is a feeder zone for ‘Intrusion 1’, a large (5400m x 400-1200m) differentiated mafic-ultramafic intrusion (Fig. 4).

Boss will commence exploration at the Lilltrask at the narrow intrusions forming one continuous intrusive belt exposed at the outcrop on the north-eastern side of the tenement (Fig. 4). The shape of these intrusions suggests that this may be a feeder zone for a major intrusion forming a large anomaly at the north-western part of the tenement (Figs. 3a and 4).