Salyn Investment Ltd. Popo Gold Prospect Investigation

Transcription

2015
Gold Prospect Investigation at 19781EL,
New-Bussa, Niger State
Salyn Investement Limited
Preliminary Geological and Geochemical
Investigation Report.
.
Salyn Investment Ltd. Popo Gold Prospect Investigation-19781EL
2015
Executive Summary
Preliminary geological and geochemical investigations were conducted on the Popo
gold prospect owned by Salyn Investment limited by Geodel Integrated System limited.
The project, which lasted about 45 days involved i.) acquisition and processing of preexisting airborne magnetic data over the area to have a pre-knowledge regional
trends of magnetic structures and lineaments
ii.)
reconnaissance geological and
structural mapping of major rock types that exist within the property iii.) delineation of
prospective portion based on the observed geology and interpreted magnetic data
iv.) geochemical sampling of residual soil and rocks along profiles at grid of 200 m by
100 m v.)
Fire assaying for gold and multi acid digestion analyses at the SGS
laboratories, South Africa vi.) Geochemical assay result Interpretation and integration
with other spatial geological and magnetic data to delineate favorable areas with high
indication for primary and secondary gold mineralisations.
The project area is mostly underlain by highly weathered and deformed gneissic rocks,
highly sheared and altered quartz vein were observed mostly in the eastern flank of the
property. The geochemical sampling procedure was planned to cover the eastern
flank and predetermined sampling locations were uploaded onto a GPS. Geologist
collected 186 residual soil and rocks using standard sampling procedures. The samples
were panned and the recovered heavy concentrates and some gold specks were
stored in the a properly labelled ziplock bag. The fire assay method used detected gold
concentration of more than 100 ppm in soil samples, while the primary gold
mineralization in the quartz vein and quartzitic rocks was up to 8.76 ppm [Appendix 1].
Other pathfinder elements or associated sulfides as copper, lead and zinc also exhibit
elevated values, mostly at location the gold concentrations were anomalous. Based
on this work done so far, “Zone A” (Pages 34- 42) seems to be an hotspot for primary
gold and other sulfides mineralisations. Further detailed sampling and geophysical
induced polarisation survey are recommended for the area.
Dr. Oladele Olaniyan (Ph.D Mineral Deposit, Canada).
GISL, ABUJA.
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Executive summary
Table of content
1.0
2.0
INTRODUCTION
1.2
Accessibility, Climate and Physiography
1.3
Exploration Licence 19781EL
1.4
Personnel
1.5
Purpose
PROPERTY GEOLOGY
2.1
3.0
Page
3
9
Geological setting
GEOCHEMICAL SAMPLING
3.1
Selection of Target Area and Sampling Locations
3.2
Sampling Approach
3.3
Sample Preparation
3.4
Panning/Washing
18
4.0
ANALYTICAL RESULTS AND DISCUSSION
24
5.0
CONCLUSION AND RECOMMENDATION
35
5.1 Conclusions- Mineralisation Potentials
5.2 Recommendations
6.0
STATEMENT OF QUALIFICATION
39
Appendix
2|Page
1.0
2015
INTRODUCTION
At the request of SALYN INVESTMENT LTD (SIL), Geodel Integrated System
Ltd. (GISL) conducted geological and geochemical investigations for
gold and other sulfide mineralisation at exploration license 19781EL
located at New Bussa area, Niger State. The field work, which
commenced on the 19th March, 2015 lasted for about 45 days.
The Popo gold property is in Niger state, in the north-western part of
Nigeria, West Africa (Figure 1 and 2). Niger state is notable rich in precious
metals, metallic and industrial minerals such as lead-zinc, silver, copper,
gold, manganese and gemstones.
Figure 1: Map of Africa showing the location of Nigeria
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2015
Figure 2a: Administrative map of Nigeria showing the project area (in red).
Legend
Town
International boundary
State boundary
Railway
Major River
Major Road
Waterbody/Dam
Figure 2b: Administrative map of adjoining states and the project 19781EL
in red box.
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1.2
2015
Accessibility, Climate and Physiography
The exploration area is located within a community called Popo, on the
eastern side of New Bussa. It was accessed via Mokwa-New Bussa tarred
road, off the Ilorin-Jebba-Mokwa Federal Highway. The exploration area
falls within the tropical savannah climate with a temperature range of
about 32°C up to 40°C at the peak of the dry season.
There are two distinct climates; hot dry season (mid-October to April) and
rainy season (May to mid-October) with average precipitation of about
600–800 mm. The area is relatively flat, but the topography undulates
gently with some valleys and floodplains. High elevated outcrops are not
common in the area. This generally flat relief is characteristic of savannah
forest dominated by grasses and shrubs as undergrowths with scattered
trees such as shear-butter and locus beans tress.
1.3
Exploration Licence 19781EL.
The 19781EL lies within the map sheet numbers 160 NW Kanji of the Federal
Survey of Nigeria topographical map sheet at the scale of 1:50,000. The
19781EL maximum vertex coordinates are Longitudes 04.31.00E and
04.32.45E and Latitudes 09.46.45N and 09.48.15N (GCS). The area is
defined by 4 vertices as shown in the table below (Table 1). The area is
about 2.7 km by 3 km (approximately 9 km²) on land, about 45 cadastral
units (Figure 3).
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Table 1: Vertex coordinates of the Exploration License 19781EL.
#
1
2
3
4
Longitude
Latitude
Degree
Minute
Second
Degree
Minute
Second
4
4
4
4
31
31
32
32
0
0
45
45
9
9
9
9
46
48
48
46
45
15
15
45
Figure 3: Location map of 19781 EL
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1.4
2015
Personnel
Personnel involved included geologist/geochemist, field assistants
and
local staff drawn from within the host community of Popo. In all, a total of
6 technical personnel, a field vehicle driver and 10 field assistants were
engaged for both the geologic mapping and geochemical sampling.
The technical personnel are:
1. Dr. Oladele Olaniyan
2. Olasehinde Dapo
3. Afolabi Wale
4. Umar Alhaji Nma
5. Philips Agbese
6. Olaniyan Lekan
1.5
Purpose
This phase of the investigation was undertaken to understand the
distribution of the different rock types and delineate the geochemical
anomalous. Delineation of the geochemical anomalous zones around the
dispersion halo will further help to narrow down into the mineralized veins,
which are the sources of the primary gold mineralization that occur within
the area.
Other specific objectives were:
a) To map all rock types, structural trends and identify their relationships
to the mineralisation
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b) To produce a geological and structural map of the exploration
area.
c) To systematically sample the residual soil, stream sediments and rock
within the area delineated has prospective.
d) To prepare and analyze collected samples for gold and other
indicator elements.
e) To establish a cutoff value for the mineralization and delineate the
anomalous region, where follow up geochemical (trenching and
banker drill) and geophysical studies would be carried out.
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2.0
2015
PROPERTY GEOLOGY
The project area falls within the western part of Niger State, which is
underlain by the metamorphosed basement rocks of the Pan African
Orogeny. Within the property, four major lithological units were mapped
during the exercise namely; migmatite/ migmatite gneisses, schist,
amphibolites and quartzofeldspathic bodies/quartz rubbles.
Migmatite Gneiss
Highly foliated and banded type of rocks were observed mostly towards
the eastern end of the project area. The strike direction is dominantly NE
at about 2300 and dip magnitude is about 600 and in the south east
azimuth. This unit of rock seems to have been deformed and highly
metamorphosed with the palaeosome being gneissic, while some
younger granitic and some quartz veins have intruded it (Figures 4 and 5).
B
A
Figure 4: Low-lying exposure of migmatitic outcrop with some later
igneous intrusions (A – Granitic,
B – Gneissic).
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Figure 5: Highly banded Migmatite exposure showing the strike (2300) and
dip (600 SE) direction
Granite Gneiss
Quartzo-feldspathic and banded with alternating mafic and quartzofeldspathic materials were observed during the mapping. They exhibit
weak foliations, which are defined by minerals alignments of a few
millimeters. It is usually melanocratic (light) in appearance and seems
sheared rock. The mineral alignment trends is 220º/38ºE. They are highly
jointed mostly in 45º, 165º directions, though both of them are parallel to
lineation of the rock which seems sheared. Shearing might be as a result
of late stage of agmatic migmatization. Lineaments observed within the
rocks have been faulted and displaced. Migmatization is believed to
preceed fracturing, as the fractures has been intruded with quartzo10 | P a g e
2015
feldsphathic minerals during or after the shearing. Minor folds and joint
sets affected this rock unit. Pegmatite and quartzo-feldsphathic veins are
parallel and oblique in orientations to foliation trends that affected the
rock unit.
Texturally,
some
outcrops
are
porphyroblastic,
while
some
are
granuloblastic. It is observed that the gneiss has a general spread across
the study area, taking a general trend of NE – SW and NNE – SSW (Figure
6a). The gneissic outcrop varies from fine – medium and medium to
coarse grained. The fine – medium grained contains more of the basic
mineral probably hornblende, while the medium to coarse is more of a
large grain of feldspar (porphyroblast) taken a preferred orientation with
the outcrop (Figure 6b).
Figure 6a: An outcrop of porphyroblastic gneiss striking 220 0 and dipping
380E.
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Figure 6b: A highly fractured and weathered ridge of gneissic outcrop
generally dipping east, containing more of the mafic minerals.
Amphibolites schist and amphibolites
Amphibolites are medium to fine-grained and granulitic in hand
specimen. Amphibole schist/amphibolite occurs as lenticular and oval
shaped bodies. They are massive to weakly foliated. They have varieties
like banded, schistose and strongly gneissic ones. They usually occur within
the migmatite – gneiss complex and the schistose type occurs at about
the central portion of the tenement towards the west. It is extremely
weathered and so poorly exposed.
They are melanocratic, black or greenish, fine grained rock in
appearance. The foliation is defined by bands of aligned amphibole
crystals (dark minerals) alternating with the alignment of lenticular
leucocratic materials (light minerals). The bands can be up to a few
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millimeters wide. The foliation plane as measured in the field is 250
(NNE/SSW).
Amphibolite also occurs as boulders scattering over an area, where there
are few outcrops. These are seen to occur both as boulders outcropping
mostly along the gneissic contacts or being hosted by the gneisses (Figure
7). They have a general trend of NNE – SSW, which is similar to that of the
gneiss. Texturally, they are fine grained with greenish coloration indicating
the presence of amphibole and they are non – foliated.
Figure 7: low lying lenses of Amphibolite trending NNE-SSW
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Granites
Two types of granites were observed; the fine grained granite and the
sheared granite (Figure 8). The fine grained granite which is a member of
the older granite suite, occurs in some places as boulders and massive in
some places. They are highly fractured and generally trending N – S. They
are felsic in color and contain more of the K – feldspar. The sheared
granite is fine grained looking foliated with a recrystallized texture making
it more brittle as if it is weathered.
Figure 8: A North – South trend of weathered granites
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Quartzofeldspathic bodies
These occur in both the country rocks as late intrusive and as pockets in
around them. They are majorly quartz and feldspar in composition.
Figure 9a: A boulder occurrence of quartzofeldspathic body
Figure 9b: Intrusive vein in a gneissic
rock
Figure 9c: weathered low lying
outcrops.
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2.2
2015
Geological Setting
Locally, the study area is characterized by Precambrian Basement
Complex rocks. The area is dominated by gneissic, schist and some
amphibolite units that have been intruded by pegmatitic and quartz rich
intrusions (figure 10). The intrusion likely resulted into an alteration aureole
in the pre-existing metamorphosed rock units. The general strike of rock
foliation and main structural trends is NNE-SSW, N-S and a few NW-SE,
while the some veins trend in N-S direction. This implies that the veins were
injected into discordants joints systems that does not conform to the
general strike of the host rock.
Figure 10: Geological map of the property EL19871.
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Furthermore, field observations indicate two shear zones at the central
portion and also towards the eastern flank. Field observation indicates
that some ferruginized and sheared quartz observed in this region, might
be related to the sulfide mineraliation (Figure 11). The implication of this in
terms of exploration is that primary enrichment may be found in altered
quartz veins and quartzitic material.
Figure 11: Highly ferruginized and altered vein quartz material within the
property.
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3.0
2015
GEOCHEMICAL SAMPLING
Two media- residual soil and whole rock, were sampled in this
investigation. Emphasis was placed on sampling requirements and
procedure in line with best practice throughout the mapping/sampling
exercise.
3.1
At
Selection of Target Area and Sampling Locations
the
completion
of
the
reconnaissance
geological
mapping,
evaluation of both the lithological units and structural trends favourable
for gold mineralization was conducted and the eastern flank of the
property was delineated for further sampling. The prospective area
selected was based on
the integration of airborne magnetic data
(airborne structural data), airborne radiometric data, field geology
observation and random sampling results (Figures 12 a-c).
The eastern flank was sampled on a grid spacing of 200 m by 100 m
(Figure 12 a-c) using UTM (Universal Traverse Mecator) coordinate system.
The sampling profile lines run east-west direction, traversing across major
lineaments and mapped geologic trend. The delineated propective area
has a dimension of approximately 3.2 km by 2.7 km. Thus, an estimated
sample point of 33 along each profile line was designed with a total
number of 14 profile lines, at 200 m inter-profile spacing.
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Figure 12a: Airborne magnetic interpretation second vertical derivative map
showing the magnetic trends as well as the sampling points in target area.
Figure 12b: Airborne potassium concentration map showing high intensity in the
eastern flank related to the quartz-rich igneous intrusions and veins.
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Figure 12c: Gelogical map layouts showing the delineated sample area.
The red spots in the EW sampling profiles were locations were visible gold
specs were recovered during the sample preparation.
3.2
Sampling Approach
Orientation survey sampling was conducted to cover the entire target
area to help determine optimum survey parameters for the entire
concession and help further delineate priority areas. This was integrated
with the initial field map. Undisturbed sites, preferably away from any
major contamination (drainage, farms, roads, etc.) were sampled. At the
sampling sites, the equipments were bushed to eliminate residue from
previous exercises and then flushed with soil from the new sample site.
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Organic horizons were scraped away as well as eliminating loose, nondecomposed matter, debris, and any possible cultural and wind borne
contamination in the course of sampling. Samples were taken from a
constant depth of approximately 25 cm below the A horizon where no
organic structure (decomposing leaves, bark, twigs, etc.) were observed.
Samples of about 4-6 kg of soil from each site were bagged in clean,
properly labelled plastic bags and the soil type noted. During sample
collection and handling, no jewelry (watches, rings, bracelets, chains etc.)
was worn to avoid contaminating the samples.
Irrespective of topographic influences and associated variability in the soil
profile samples were collected at about 25 cm below the A horizon with
due regard to the thickness and nature of the soil horizons, soil moisture,
presence or absence of suspended aqueous material within the soil and
general characteristics of the overburden in the survey area (Figure 13).
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Figure 13: Sampling and pitting operation at selected locations.
In all, a total of 162 panned concentrate samples were gathered with 24
selected whole rock samples (mostly altered and mineralized quartzites
materials along the sampling course).
3.3
Sample preparation -Panning and labelling
At the panning site, the soil material were pre-concentrated through
panning (gold panning method). The panned concentrate recovered
are mostly heavy concentrates and some gold specks (Figure 14). The
concentrate were then bagged in a smaller self-sealed plastic bags and
labelled accordingly.
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Panned heavy metals
Gold speck
Panned heavy metals
sand
Figure 14: Recovered panned concentrates contain some gold specks,
heavy metals and sand.
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4.0
2015
ANALYTICAL RESULTS AND DISCUSSION
A total number of 186 soil and rock samples were analyzed in SGS
laboratories, South Africa using Fire assay for gold and multi acid digestion
methods. The fire assay used detected gold concentration of more than
100 ppm in soil samples, while the primary gold mineralization in the quartz
vein and quartzitic rocks was up to 8.76 ppm [Appendix 1].
With 0.02 ppm set as the background value for gold concentration, gold
concentration above 0.02 ppm were deemed as anomalous values and
plotted on the geological and magnetic maps (Figure 15 – 20) to illustrate
the possible continuities and the relationship with the geological units
and structures.
Spatial distribution of gold concentration in the soil in relation to the
geological contact (Figure 15), indicates some highly anomalous values
are related to mapped vein quartz corridors and rock contacts. The
anomalous zones have been classified in A, B and C based on the
number of anomalous values respectively. Zone B has the highest gold
concentration of 100 ppm, while Zone B and C have a maximum of 1.15
ppm and 0.3 ppm of gold respectively. In Figure 16, gold concentration in
whole rock is highest in the Zone A with a modal concentration value of
8.73 ppm, while Zones B and C recovered up to 0.92 and 0.36 ppm from
the vein rocks there.
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B
A
C
0
0.15
0.3
0.6 Kilometers
Figure 15: Plot of anomalous gold concentration in the residual soil. The
concentration is more than 100 ppm in the northwestern portion of the
sampled area.
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B
A
C
0
0.15
0.3
0.6 Kilometers
Figure 16: Spatial distribution of gold concentration in vein quartz and
quartzites.
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Saprolite
50- 100 cm
Highly
sheared and
mineralised
quartz vein
50- 100 cm
Figure 17: A section of the pit location within Zone A. Highly sheared and
altered quartz veins – 8.3 ppm of gold, up to 47.9ppm of copper, up to 62
ppm of lead, and 68ppm of nickel.
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Figure 18: Artisanal gold mining field within the zone A region.
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B
A
C
0
0.15
0.3
0.6 Kilometers
Figure 19: Gold concentration in the residual soil on the geological map.
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B
A
C
0
0.15
0.3
0.6 Kilometers
Figure 20: Gold concentration map on the second derivative map.
Anomalous values tend to be associated with magnetic inflection points,
where magnetic lineaments have been interpreted.
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B
A
C
Figure 22: Gold Pathfinder/ associated elements - Copper concentration
distribution map on the geological map. Modal concentration of up to
47.9 ppm of copper occurs in the whole rock obtained at zone A region.
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B
A
C
Figure 23: Gold Pathfinder- Lead is highly dispersed and associated with
mapped veins and soil. A modal concentration of 62 ppm of lead occurs
in the whole rock and 39 ppm in soil.
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B
A
C
Figure 24: Spatial distribution map of zinc concentration in relation to the
geological map.
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2015
B
A
C
Figure 25: Nickel concentration appears to be more anomalous around
the Zone A with modal value of 20 ppm and 68 ppm in rock and soil
respectively. Other zones show moderately high values.
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5.0
CONCLUSION AND RECOMMENDATIONS:
5.1
Conclusions- 19781EL Mineralisation Potential
2015
Gold occurrences around the prospect area varies in distribution and
potentials. Two modes of gold mineralization have been identified
around the locality- Primary gold in the veins, stringers and dykes
associated with faults, shear and brecciated zones, and the secondary
gold mineralization concentrated by mechanical processes as alluvial
deposits and occurring as placers and paleo placers along streams and
river channels or as eluvia deposition resulting from insitu break down of
gold bearing veined rocks to form considerable concentrations of gold
bearing gravely layer and saprolite above the bedrock.
At the Popo gold prospect, primary gold and other sulfide mineralization
are associated with brecciated and hydrothermally altered shear-zone
lying in fault / contact with quartzitic rocks, fractured and sheared altered
laminated quartz veins and veinlets of varied thickness. The quartz veins
are observed to have undergone some alteration processes, which
resulted to possible mineralization.
During the soil sample preparation, heavy metal concentrates and some
visible gold specks were recovered in the panned concentrates. With few
having visible gold specks as flakes. Fire assay analytical method for gold
indicates, the likelihood of rich alluvial deposit of more than 100 ppm.
Likewise, occurrence of elevated assay values of other sulphides such as
lead, zinc and copper and nickel, especially around anomalous gold
concentration values in soil and rock, further confirm this assertion (Figures
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21 - 25. These elements often referred to as pathfinder elements for gold,
owing to their almost consistent association with gold.
From this investigation, it was observed that the mineralization pattern is
structurally controlled and consistent with the dominant magnetic trend of
NE. Anomalous sulfide concentration locations generally align with the
magnetic inflection point, where magnetic bodies or lineament are
expected to be located at the subsurface.
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Figure 26: Reconnaissance pictures of AAY gold Mine and altered/
mineralised quartz materials obtained at about 15 meters depth. AAY
Mine shares the northern boundary with this 19781EL- Popo Gold prospect,
and falls within the same schict belt of similar geological setting.
Based on the fire assay results, the region roughly delineated as Zone A
(Figures 15 - 25) has elevated values of both gold and other sulfides in
rocks and soil samples. This portion seems to be a mineralisation hot spot,
should be further sampled and trenched to obtain deeper samples for
analysis. Zones B and C also have good prospect for primary deposit in
quartz veins, as some elevated gold concentration values occur within
the corridor of mapped quartz veins.
5.2
Recommendations
GISL considers results of this preliminary gold investigation as very
successful and indicative of sulfide mineralisation within the property.
Effort should be made to carry out more detailed bulk sampling at small
grid and trenching across veins that have shown some elevated
37 | P a g e
geochemical
anomalies,
for
the
purpose
of
indicated
2015
resource
estimation.
Secondly, primary sulfides mineralisation in the schist belt of Nigeria is
mostly disseminated within the host rock, therefore geophysical methods
appropriate for disseminated mineralisation such as time domain induced
polarisation be conducted to properly define the host rock, investigate
the continuity and likely geometry of the ore bodies at the subsurface.
Subsequently, target drilling will be conducted to test isolated geophysical
and geochemical anomalous structures.
38 | P a g e
6.0
2015
STATEMENT OF QUALIFICATION
Olaniyan Oladele F.
-
BSc Geology (2002), University of Ado-Ekiti, Nigeria
-
MSc Geoinformatics (2007), ITC, Netherlands
-
Ph.D. Exploration Geophysics, Laurentian University, Sudbury, Ontario,
Canada.
For the past 11 years, I have been actively involved in mineral exploration
projects in most part of Nigeria and other parts of the world including Canada,
Guyana and Ghana.
A member of Canadian Exploration Geophysicists Society (KEGS)
A member of Council of Nigerian Mining Engineers and Geoscientist (COMEG)
A member of Nigerian Mining and Geosciences Society (NMGS)
An associate member of the Society of Exploration Geophysicist (SEG)
Dated and signed at Sudbury, Ontario, Canada this 24th day of Mach, 2015.
24/03/2015
_________________________
Olaniyan Oladele (Ph.D. Mineral Deposit, Canada)
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Appendix 1: SGS Fire Assay And Multi acid digestion test results.
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Salyn Investment Ltd. Popo Gold Prospect Investigation

Transcription

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