The western part of the property, belongs to the La Grande sub-province and is dominated by mafic volcanites sequences and by dioritic and granodioritic intrusions; the eastern part belongs to the Opinaca sub-province and is dominated by metasedimentary formations sequences..
M. Gauthier and L. Paquette (MB 97-02) describe one of the La Grande units as follows:
"One of the five large lithostratigraphical units of the La Grande and the Opinaca sub-provinces consists in an arenite, archean relic, in which are found sills and ultramafic lopolites (Roscoe and Donaldson, 1988) ". This unit has been named the "Apple Formation".
Part of the Matamec Sakami property is occupied by this formation. The mafic volcanic rock consists in a massive basalt with a gabbroic texture or deformed pillowed textures. These basalts are sometimes metamorphosed by leaching, involving an enrichment in aluminous minerals such as biotite and garnet. These volcanites are sometimes strongly stretched as shown in the drill core. Locally, lapilli and cinders tuffs have been observed with felsic dykes. A few polygenic conglomerates and bedded iron formations (oxides, sulphides and silicates) have also been identified in the region. Thin iron formations sequences with limited lateral extensions are intercalated with large volcanic sequences. The basalts belong to the Yasinski group as defined by Goutier and al. (2000). A few amphibolitic facies were also observed in the field, composed essentially of black and green probably ancient
Summary of the works carried out
SECTOR |
PROSPECTING GÉOLOGY |
AREA COVERED (km²) |
LINE-CUTTING (km) |
DRILLING |
SURFACE SAMPLING |
GÉOPHYSICS (line-km) | |
PP |
MAG | ||||||
La Pointe |
Traverses at 50m. |
1.5 km² |
32.6 km |
41 holes (7889m) |
266 |
24.6 km |
32.6 km |
JR |
Traverses at 100m. |
12 km² |
79.2 km |
5 holes (595 m) |
126 |
50.4 km |
79.2 km |
Péninsula |
Traverses at 100m. |
10 km² |
71.2 km |
4 holes (644m)* |
48 |
9.5 km |
71.2 km |
Island |
Traverses at 100m. |
17 km² |
|
|
154 |
|
|
Sipanikaw |
Traverses at 100m. |
18 km² |
|
|
189 |
|
|
Total |
|
58.5 km² |
183 km |
50 holes |
783 |
84.5 km |
183 km |