MUNDIYAWAS-KHERA COPPER- GOLD-SILVER DEPOSIT, … · SIGNIFICANCE OF MUNDIYAWAS-KHERA...

Presented by

ISRAIL KHAN, Senior Geologist

MUNDIYAWAS-KHERA

COPPER- GOLD-SILVER DEPOSIT,

THANAGAZI TEHSIL, ALWAR

DISTRICT, RAJASTHAN

Team Members:

D.K. Rai

P. R. Sahoo

D. Boopathi

S. Mukhopadhyay

Mundiyawas-Khera

Copper-Gold-Silver

Khetri Copper Belt

Geological map of

Western Region

Mundiyawas-Khera area on Satellite Image

Panoramic view of Mundiyawas-Khera area

Mundiyawas-Khera Discovery of polymetallic deposit(Cu-Au-Ag) in the Ajabgarh Groupof the Delhi Supergroup.

METHODOLOGY ADOPTED

Systematic geological mapping

Geochemical sampling

Ground geophysical survey

Data integration

Detail mapping, delineation of mineralised zones

and planning of boreholes

EVIDENCES OF HYDROTHERMAL ALTERATION AND FELSIC VOLCANISM

Feldspar

Phenocryst

Embayed

quartz

ScapoliteMatrixScapolite

1 cm

Cp

Nature of subsurface sulphide Mineralisation, Mundiyawas-Khera area

Cp

Po

Stringers and disseminations of chalcopyrite (Borehole

KBH-2, 80.50 m depth)Chalcopyrite vein parallel to foliation and quartz vein

containing pyrrhotite and chalcopyrite (Borehole KBH-2 ,

89.0 m depth)

Fracture filled coarse grained chalcopyrite (Borehole

KBH-2,48.80 - 49.30 m)

Au= 86 g/t

Cu= 0.72%

Ag = 11 g/t

Chalcopyrite with arsenopyrite (Borehole KBH-6, 257.35 –

257.58 m depth)

Cu= 14.35%

Ag= 70 g/t

Au= 3.54 g/t

Asp

Cp

Cp

1 cm

Stringers and massive chalcopyrite, arsenopyrite and pyrrhotite, Mundiyawas

Block (Borehole MUBH-1, Depth: 201.80-202.40 m)

Cu= 12.0% , Ag= 40 g/t

5 cm

Borehole MUBH-1, Depth: 200.50-201.55 m, Cu= 11.0% Ag= 60 g/t

Chalcopyrite in association with

pyrrhotite hosted within the tremolitic

marble.

An euhedral arsenopyrite occurring

within the massive pyrrhotite (136.45 m

depth, borehole KBH-2)

Cp Po

Asp

PHOTO MICROGRAPH OF ORE MINERALS

Native copper

Native copper in the zone of oxidation

Au-Ag alloy occurring along a

chalcopyrite vein

Au-Ag alloy

Au-Ag alloy CpPoPo

Pent

Cub

Chalcopyrite (Cu ore) occuring as

dominant phase within the felsic

volcanic rock.

Minor pentlandite (Ni-ore) occurring

with the exsolved phase of pyrrhotite

and cubanite.

SALIENT FEATURES OF MUNDIYAWAS-KHERA COPPER-GOLD-SILVER DEPOSIT

Stratigraphy & Age: Thanagazi Formation, Ajabgarh Group, Delhi Supergroup,

Mesoproterozoic Age.

Geometry of the ore body:

Strike length : 630 m

Width : 100 m (cumulative)

Depth persistence : Over 200 m

Host rocks of mineralisation:

Felsic metavolcanic

Tremolite marble

Sulphide mineralisation: Chalcopyrite, pyrrhotite, arsenopyrite, pyrite, galena,

pentlandite and cubanite

Nature of mineralisation: Disseminations, stringers, massive and vein

Width of lode Grade

Copper: 2.0 m to 46.20 m 0.2% to 14.35%

Gold: 1.0 m to 5.50 m 0.5 g/t to 86.0 g/t

Silver: 1.0 m to 5.50 m 5 g/t to 70 g/t

Primary sulphides occur from shallow depth ~ 10 m to about 200 m vertical depth.

The mineralisation is stratabound in nature. RESOURCE

SIGNIFICANCE OF MUNDIYAWAS-KHERA

COPPER-GOLD-SILVER DEPOSIT

High tonnage and low to medium grade deposit

The occurrence of gold and silver mineral association (native

gold and Au-Ag alloy) make this deposit economically more

viable.

The high width of the ore body makes it distinct from all other

copper occurrences explored so far in Western India. High

thickness and proximity to the surface make this deposit

mineable by open cast methods.

Similar type of deposits are expected in other parts of Alwar

basin

The sustained mineral exploration program in the area will

further augment the copper resources of the country.

MUNDIYAWAS- KHERA AREA

• Khera Block (G-2)

Khera SE Block (G3)

Mundiyawas Block (G3)

ANGARI BLOCK

AGAR BLOCK

TEHLA-KHOH-BIGHOTA AREA

FUTURE EXPLORATION STRATEGY

THANAGAZI

The future belongs to those who can effectively and efficiently

prospect the concealed terrains

Thank you……

GSI Base camp, Thanagazi

Parameters

Value

(ppm)

Log inv

(ppm)

Mean (X) 132.522 71.61

Stad. Dev. (SD) 296.379 2.42

Minimum 10.000

Maximum 3200.000

X+SD 74.03 173.78

X+2SD 76.45 420.8

X+4SD 81.29 2471

Khera Block

Mundiyawas Block

Khera SE Block

GEOPHYSICAL SURVEYS CARRIED OUT AT MUNDIYAWAS-KHERA AREA

INDEX

Boreholes FS 2010-12

Boreholes FS 2012-13

Boreholes FS 2013-14

KBH-5

KBH-4

KBH-10

KBH-6

KBH-2

KBH-8

KBH-1

KBH-16

KBH-11

KBH-12

KBH-13

KBH-14KBH-3

KBH-15

KBH-17

KBH-18

Boreholes FS 2014-15

DETAILED GEOLOGICAL MAP OF KHERA BLOCK

KBH-7

KBH-9

SURFACE INDICATIONS OF MINERALISATION

Malachite stain in tremolite bearing

dolomitic marble

Malachite stain in felsic meta volcanic

(Rhyo-dacite)

Borehole KBH-1, Khera Block

SUBSURFACE EXPLORATION

Name of the

Deposit

Resources

(MT)

Grade Metal

content

(tonnes)

Cost

( Rs. in Cr.)

Khera Block

(FS 2010-14)

30.57 Mt Cu ore

1.96 Mt Au ore

2.33 Mt Ag ore

0.35%

0.69 g/t

7.28 g/t

106995 Cu

1.3524 Au

160.962 Ag

4117.07

359.31

618.01

Khera South

East Block

(FS 2013-14)

3.28 Mt Cu ore

0.11 Mt Ag ore

0.76%

5.0 g/t

24928 Cu

0.55 Ag

959.35

2.11

Total 33.85 Mt Cu ore

1.96 Mt Au ore

2.44 Mt Ag ore

0.39%

0.69 g/t

7.18 g/t

131923 Cu

1.3524 Au

161.512 Ag

6055.91

MUNDIYAWAS-KHERA RESOURCE