PT.

 GORONTALO
SEJAHTERA MINING

Best Exploration Practice in Discovery of Pani :

The New Insight of Structural Control in North
Nanasi
INTRODUCTION Nanasi Prospect located at northern part of west Baganite Corridor, morphology the area formed by northwest and west-northwest block faulting or vents of ring fault. Three
elevated morphology controlled by northwest and west-northwest and northeast structures. The elevated morphology consist Nanasi North, Nanasi Northeast and Nanasi Ridge. Nanasi

±
Pani Block is located on well known as Pani District, on the northern arm of Sulawesi Island, Indonesia. A town of Marisa is the nearby economic and governmental centre of the district, in an approximate morphology have similar pattern with Pani Ridge, northeast ridge splay of northwest ridge, distance of the both prospects about 1.3km as long as NW ridge.
distance of 15 kilometres and easily accessed via mostly sealed road sections from main base camp at Butato village. No any further vehicular accesses to get to exploration drill camp at Ilota, all journey has to be
made on series of foot‐tracks at about a 3 kilometres distance from the last motorcycle section. Pani District is one of artisanal gold regions in Kabupaten Pohuwato, a newly established autonomic district in the
province.

District Geology Pani Sedimentary breccia

A
Solidification‐ unsolidification
Classified geology Pani district in Miocene granodiorite basement and sedimentary of rhyodacite,
Pliocene‐Plistocene rhyodacite (Pani Volcanic Complex). quartz vein fragment, hosted of
quartz vein
Miocene granodiorite basement observed as microgranodiorite, diorite, Quartz vein LSE
andesite, fractured and foliated texture mapped at western and high ratio of Ag : Au, lattice
northern the district area. bladed, crustiform &
colloform quartz vein texture
Pliocene‐Plistocene rhyodacite divided in equigranular ryodacite and
porphyritic rhyodacite. Crackle breccia LSE
*Figure 6. Overview of the northwest Nanasi ridge, and northeast – southwest spure North Nanasi,.Morphology the area formed by northwest and west‐northwest block faulting or vents of ring fault

±
low ratio of Ag : Au, sugary‐
EXPLANATION
Medium equigranular hornblend‐biotite granodiorite and basaltic to pyrite‐chlorite & drusy‐comb
dolerite as part of Miocene basement Tinombo Formation and mapped quartz fit the crackle breccia, Quartz drussy comb bx vn Au1_ppm # 0.500 - 1.00 Fault

around of vicinity Pani Volcanic. Contact intrusive between fractured veinlets to stockwork Pyroclastic # 0.001 - 0.20
# 1.00 - 3.00 River

and foliated granodiorite with massive hornblend‐biotite equigranular Diatreme Breccia # 0.20 - 0.30
# >3.00
Crackle breccia Au‐Cu‐Zn‐Pb
ryodacite mapped at western Pani Volcanic. Pani Volcanic Complex Porphyrytic Rhyodacite # 0.30 - 0.50
B milky‐drussy quartz silisic
overlay of hornblend‐biotite equigranular rhyodacite and hornblend+/‐ Equigranular Rhyodacite
sulfide breccia veins within
biotite porphyritic rhyodacite, brecciated due to intrusive contact and
pyroclastic unit
fault breccia, phreatomagmatic and phreatic breccia, acretionary lapily ‐
volcanic breccia tuff. Pyroclastic
Lithic tuff, accretionary lapilli
Mineral resources estimate (indicated +inferred) are 66.561 Mt @ 0.96 tuff to volcanic breccia,
phreathomagmatic explosive A
g/t Au, containing 2062,983 Oz Au (Fig. 1 and 3)
product
C
MINERALISATION (Fig. 2) Diatreme breccia

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1. Au ±Ag (± Pb‐Zn) quartz vein stockworks & breccias (Ilota Nanasi) Polymictic phreathomagmatic
2. Au‐Ag‐(Zn‐Pb) milky quartz silisic sulfide breccia veins within breccia, Prheatic breccias.
pyroclastic unit, (North Nanasi)
3. Zn‐Pb‐Cu‐(Au‐Ag) quartz vein breccia, massive & stockwork (Lone Porphyritic rhyodacite
Pine) 2‐4 mm & >20% quartz phyric,
4. Au‐Ag (± Pb‐Zn) veins breccia (Kolokoa) common of corroded breccia 9.00m @ Au 0.77 g/ton
*Figure 1. Geology map of the Ilota, Nanasi, Parabola, Borose, Masina, Wadi, 
Jahiya, Lonepine, Kolokoa, Ilota TBK, Simpang Tiga 5. Zn‐Pb‐Cu‐(Au‐Ag) quartz +Ca veins (Simpang Tiga) and flow bands 14.00m @ Au 0.37 g/ton

Zn‐Pb‐Cu‐(Au‐Ag) quartz +Ca 18.00m @ Au 0.92 g/ton 

veins B

B
Quartz Crackle breccias
Dark grey quartz‐pyrite‐comb
A quartz fit the crackle breccia, B
C
veinlets to stockwork
Boiling level A
Equigranular rhyodacite
Fine to medium grain rhyodacite,
dacite dyke, massive with less flow
band.
*Figure 6. Geological map of the Nanasi prospect and interpreted SE – NW section , looking 
Granodiorite Northeast 
Microgranular phanaretic & Lithology ring fault of Baganite corridor, Ash tuff (Fig.7A), Accretionary lapilli (Fig.7B),
diorite, andesite intrusive lapilly tuf (Fig.7C),, volcanic breccia (Fig.7D), intercalated as pyroclastic unit covered from
467masl to 350masl, Equigranular Rhyodacite, masive to flowband (MVRD - FVRD)
(Fig.8D) and “corroded” magmatic breccia (BRD) as primary texture below the pyroclastic A B C D
unit (Fig.8B), and polymictic phreatomagmatic breccia (BD) (Fig.8A), Porphyritic Rhyodacite *Figure 7.close up pyroclastic unit covered
*Figure 2. Conceptual geology and mineralization model, intruded (Fig.8C).
A Contact fragmented due fractured structural deformation and intruded polymictic
and overview of the Ilota, Nanasi, Parabola, Borose,
B Masina, Wadi, Jahiya, Lonepine, Kolokoa, Ilota TBK, phreatomagmatic breccia (BD)
Simpang Tiga Alteration Silica chlorite altered of hyallo fracturing equigranular rhyodacite, white argillic to
C
silica argillic altered of pyroclastic unit, and polymictic preatomagmatic breccia (BD).
Structure sheeted NW fractures and sheared, NNE and NE limonite-goethite/hematite
fractures and quartz veinlets and EW fractures. Southwest part mapped lithological contact D
A B C
between equigranular rhyodacite with polymictic phreatomagmatic breccia, oxide, strong
fracturing and gentle of flow banded and corroded magmatic breccia also observed. Small *Figure 8. close up polymictic Porphyritic Rhyodacite, Equigranular Rhyodacite
area mapped argillic of volcanic and kaolinite.NNE-NE fractures and quartz veinlets more
intense in this area especially at hornblende rhyodacite. Mineralization fine to coarse visible gold observed in multistage quartz vein breccia & veinlet zones with sulfide (pyrite,
±covelite, ±chalcopyrite), partially oxidized (jarosite-goethite), the mineralization zone hosted at quartz silicified to silicified
argilic altered of pyroclastic unit and rhyodacite. Chalcedonic, drussy and comb are texture vein.

N-S, NNE

Vein Rossette Diagram

1
1 N-S, NNE, NE

ENE - WSW

NW - SE

Dextral NW, NNW

2
N
*Figure 3: Upside Potensial Pani gold project
*Figure 4. North Arm of Sulawesi with North Sulawesi Trench and parallel northwest structure. The depth of 
hypocentrum in Pani Project has more intense and steep vertical distribution
W E Sinistral NNE, NE
3
TECTONIC FRAME AND STRUCTURAL HISTORY

North Sulawesi Arc about 500 km length arc from eastern Toli‐toli until Manado. North Sulawesi S
Trench is an active subduction, besides uplift and rifting also intense of extensional structures mapped
at the southern arc. Intensive WNW‐NW extensional structures probably is one of reason existing and 3
still preserve of alkaline rock. The central part of northern arm of Sulawesi where Pani is one of the
known 'gold district' in Gorontalo.
North Arm of Sulawesi with North Sulawesi Trench and parallel northwest structure probably as
triggers of metallogenicaly system. According the earthquake data, there two clusters has almost
similar intensity and hipocentrum. Pani Project and Tambolilato/Motomboto Project are two
prospects have been explored and high potential as gold deposited and gold‐copper deposited.
Intensity and depth of hypocentrum in Pani Project has more intense and steep vertical distribution. NNE, NE, ENE
crackled drussy comb
These facts, Pani Project have more potential for gold‐copper porphyry under neat than xtl Tuff vol Bx
crustiform bx

Tambulilato/Motomboto Project. (Fig. 4).

Structural features and/or lineaments are dominantly trending ESE and NNW. The prominent ESE Qtz crystalline coarse – fine elongate Size and shape Gold :
Qtz Crustiform comb drussy +gold
structures are long range lineaments and fault corridors correspond to the east ‐ west stretch‐out Primary Texture No visible gold Qtz Crustiform comb drussy +gold
Medium ‐ coarse and flake visible
arrangement of northern arm (arc‐parallel); and regularly are stripped by spaced long‐range NNW Qtz crystalline needle – fine gold set in crustiform comb drussy.
fault zones of arc‐normal; and other short‐range NE conjugate faults of arc‐normal and related circular elongate and clear veinlet –vein,
bx vein Primary Texture and 
features. At Pani for instance, is thought to represent ring fractures and diatreme system developed
crustiform superzone Dush, fine grains and disseminated
*Figure 5: Simplified geology map of Gorontalo Mineral district showing general rock units (Caira & Pearson, 1999) around advancing felsic intrusions. (Fig. 5).
gold set in massive drussy
crystalline.
Surface Geochemical – Soil Anomaly Geophysics feature Qtz Crustiform comb drussy +gold
Res RTP Drussy massive py+sulphide +basemetal
3 ‐ 5% py dull – cubic, sulphides
Drussy massive py +sulphide +basemetal
Qtz Crustiform comb drussy (covelite, chalcopyrite), sphalerite
+microcrystalline ‐ milky dominantly pyrite Metal
chacedonic +gold
depositional stage (gold, iron, etc),
Staining FeOx

Drussy massive – bx py +sulphide

(cov +cpy) +basemetal (sp +pb)

Drussy massive – bx py +sulphide

(cov +cpy) +basemetal (sp +pb)

Drussy massive – bx +cov +cpy +sp +pb

Open space fill : Qtz Comb – groups

of parallel or subparallel of quartz
crystals oriented perpendicular to
vein wall, resembling of the teeth
Resistivity of a comb

±
Qtz Crustiform comb drussy + fine gold

Qtz Crustiform comb drussy, White chalcedonic +gold

Historic Data  Summary geology

Drillcore seven holes was 
drilled at 2017 with some 
significant intercepted. 
3 multistage of visible gold observed at Nanasi NE:              
NND137 :  4.2m @0.43g/t Au  1.Flaky gold bearing by drusty quartz veinlet in vein breccia,           
from 3.8mdh, 3.7m @0.74g/t  2.Disseminated fine grain gold bearing by white chalcedonic fit 
Au from 121.8mdh;          the vein breccia.,                                                                                     
NND153 : 12m @0.37g/t Au  3.Disseminated dash gold bearing with milky fine sugary quartz fit 

±
from 100.5mdh, 7.8m  vein breccia
@0.72g/t Au from 137.3mdh

The challenge of discovering new prospects in the Pani project is to explore in soil cover and Chargebility Au  Case 
alluvial gold deposits or material from artisanal miners overlying insignificant hard rock gold SG Volume Tonnes  Ounces 
ppm scenario
mineralization, it means that we need to evaluate exploration techniques. A surface geochemistry
in Pani project must be consider as the impact of tropical weathering, due to considerable 2.2 1391563.34 3061439.34 0.50 31.1034 49213.9017 Min Case
remobilization of metals in the soil profile, which affects the signature of bedrock mineralization.
Geochemistry analysis has been campaigned to delineated gold and base metal related
anomalous, and emerging open opportunity to explore more deeper deposit. 2.2 1391563.34 3061439.34 0.80 31.1034 78742.24271 Best Case

Soil anomaly show copper (Cu) Anomaly on NNE Spur which is coincide and enveloped by Zinc
(Zn) and Lead (Pb) anomaly. Gold Anomaly is moderately coincide with silver (Ag), arsenic (As), 2.2 1391563.34 3061439.34 1.00 31.1034 98427.80339 Max Case

copper (Cu), anomaly, which is Arsenic anomaly is slighty coincide with Cu anomaly

Chargeability and resistivity anomaly related with strong hematite/limonite fracturing +/‐quartz References
veinlets in hornblend rhyodacite. Low resistivity and chargebility circular feature uncertain related Alfend Rudyawan, Robert Hall, Lloyd White., Neogene Extension of the Central North Arm of Sulawesi, Indonesia., Southeast Asia Research Group, Earth Science Department, Royal Holloway
University of London, Egham, Surrey, TW20 0EX, United Kingdom
with polymictic phreathomagmatic breccia, porphyritic rhyodacite rich hornblenda.
Riedel, S., 1992. Sistemas de Riedel