Geological report on Limestone Exploration of Goyla Block, Abadasa Taluka, Kachchh District, Gujarat. Executive Summary

Transcription

1 Geological report on Limestone Exploration of Goyla Block, Abadasa Taluka, Kachchh District, Gujarat Executive Summary Prepared for Commissioner of Geology & Mining Government of Gujarat Prepared by Geovale service Pvt. Ltd 56, Ideal villas, Kochpukur, Rajarhat Kolkata West Bengal November, 2015

2 Geological Report on Limestone Exploration of Goyla Block, Abadasa Taluka, Kachchh District, Gujarat Executive Summary Prepared for Commissioner of Geology and Mining, Gujarat Geovale Services Pvt. Ltd 56, Ideal Villas, Kochpukur, Rajarhat Kolkata West Bengal, India E: info@geovale.com November, 2015

3 Executive Summary Goyla Block in the Abadasa Taluka in the Kachchh District of Gujarat. It is a N-S elongated irregular polygonal block with an area of km2 (261.9 Ha) having dimensions of approx. 3.6 km in length and 1.77 km in width. The block (Figure 1) is divided into two non-contiguous blocks (Goyla 1 in the north is 1.46 km 2 area and Goyla 2 in the south is km 2 area). The Goyla block has been part of regional exploration conducted by Commissioner of Geology and Mining (CGM) through a Rapid Reserve Assessment Survey (RRAS) in The Goyla Block was f u rther e x p l o re d i n detail by Gujarat Mineral Development Corporation (GMDC) in Cement grade nummulitic limestone occurs in the G o y l a B l o c k i n t h e Eocene - Oligocene Fulra Formation and Oligocene - Miocene Maniyara Fort Formation, which are part of the Tertiary Platformal sediments of Kachchh. Maniyara Fort Formation is exposed over most of the block, while nummulitic limestones of Fulra Formation have been intersected only in diamond core drillholes. Manyiara Fort Formation has shale, clay and sandy litho-units interbanded thin limestone units. The multiple beds of greyish white to yellowish grey micrite supported nummulitic Fulra Formation limestone define the mineralised body. The cumulative thickness of the Fulra Formation limestones, range from 12 m to 15 m. The cement grade limestone has a number of partings of clay and shale. The overburden in the area, belonging mainly to Maniyara Formation, range from 5 t o 1 5 m mostly. However, towards the southern part of the Goyla Block, shale and clay lithounits belonging to Khari Nadi Formation, overlie Maniyara Fort Formation, thus contributing to development of a thicker overburden of upto 35 m. Goyla Block has a relief of 23 m, with altitude ranging from ~30 m to ~53 m above the MSL. The topography is gently rolling with a moderately elevated landform at the southwestern and northeastern parts of the block. A thin 1 3 m veneer of red brown soil overlies the Maniyara Fort Formation in most part of the block. The block is located at about 32 kms from the Arabian Sea coastline. GMDC organized the topographic survey using Total Station theodolites. DGPS surveys have been carried out to define the boundary of the block. 66

4 diamond core drillholes, totalling 2887 m have been drilled within the Goyla Block in a 200m x 200 m grid. 674 half split core sample composites from 1 to 2 m length each were pulverized to 150 microns at site and sent to Inspectorate Griffith s (IG) wet chemical laboratory at Gandhidham in Gujarat for assay. Element suite determined at IG's laboratory include SiO 2, Al 2O 3, Fe 2O 3, TiO 2, CaO, MgO, P 2O 5, Na 2O, K 2O, Cl, SO 3, R 2O 3 and LoI along with specific gravity on Dried Air basis using IS standard procedures. Geovale Services finalized the Geological Report of the Block based on the data provided by the CGM and GMDC. It carried out the 3D Geological Resource modeling of the ore body, using GEOVIA SurpacTM software. The ore body modeling process involved developing a geological database from the drillhole database, which has been validated by classical statistics and geostatistics. Surpac allows the data visualization by creation of sections along desired directions and defining ore-waste contact by manual on-screen digitization. The two stage solid modeling of the ore body by wire-framing the digitized cross sections and block modeling (50m x 50m x 2 m blocks) on the basis of geostatistically derived parameters allows estimation of 3D ore volume and block wise grades. Resources and grades have been derived using both the Krigging interpolation methods. Though the specific gravity ranged from 2.2 to 2.6, a bulk density of 2.25 has been used as advised by the CGM, Gujarat for the tonnage determination of the limestone ore body. A cut-off grade of 37% CaO and cut of width of 1.0 m thickness of limestone band has been applied to determine the resource volume and grade for every Surpac block. In Goyla, GMDC carried out General Exploration (G-2 Stage) exploration. The Geological Resource o f l i m e s t o n e i n t h e B l o c k has been classified based on the Minerals (Evidence of Mineral Contents) Rules, 2015 notified by the Ministry of Mines. The total Geological Resource established in Goyla Block is 68 Mt of Indicated Mineral Resources (UNFC 1997, 332 category).

5 Table 1 summarises the grade wise Indicated Geological Resource (UNFC 332) of the Goyla Block (also separately shown for the two sub-blocks). Table 1: Summary Resource Classification: Goyla Block CaO% Range Sub-Block A (North) Sub-Block B (South) Total Volume (m 3 ) Tonnes CaO% Volume (m 3 ) Tonnes CaO% Volume (m 3 ) Tonnes CaO% Grand Total The following table provides the summary information about Goyla Block. Table 2: Summary Information Table: Goyla Block Name of the Block Goyla Location Summary Village Taluka District State Goyla Abadasa Kachchh Gujarat Area Summary Size of the block (Sq km) Boundary coordinates: Goyla 1 Point Easting Northing Latitude Longitude BP '18.391" 68 47'21.509" BP '23.133" 68 47'25.836" BP '28.027" 68 47'39.402" BP '36.244" 68 47'51.574" BP '41.951" 68 48'12.177" BP '39.116" 68 48T4.279" BP '35.411" 68 48T3.231" BP '34.151" 68 48'13.459" BP '33.903" 68 48'11.826" BP '31.163" 68 48T2.837" BP '32.057" 68 48'15.361"

6 BP '22.634" 68 48'26.669" BP '58.691" 68 48T6.659" BP '11.094" 68 48'1.57" BP '15.9" 68 47'59.789" BP '15.629" 68 47'54.994" BP '19.355" 68 47'53.227" BP '17.747" 68 47'50.444" BP '16.318" 68 47'49.078" BP '13.361" 68 47'52.162" BP '13.699" 68 47'53.706" BP '12.091" 68 47'52.757" BP '7.696" 68 47'47.42" BP '10.372" 68 47'35.649" BP T.12" 68 47'35.012" BP '57.654" 68 47'36.128" BP '54.679" 68 47'41.461" BP '53.264" 68 47'42" BP '51.954" 68 47'40.828" BP '49.168" 68 47'29.246" BP '47.934" 68 47'30.613" BP '46.545" 68 47'33.931" BP '46.742" 68 47'26.526" BP '45.75" 68 47'25.591" BP '49.632" 68 47'21.069" BP '50.092" 68 47'22.671" BP '52.114" 68 47'23.592" BP '53.635" 68 47'31.263" BP '54.964" 68 47'33.98" BP '58.143" 68 47'33.04" BP '58.428" 68 47'28.945" BP '57.032" 68 47'24.364" BP '4.374" 68 47'22.662" Boundary Points Goyla - 2 Point Easting Northing Latitude Longitude BP '13.243" 68 47'30.353" BP '3.095" 68 47'46.868" BP '0.237" 68 47'43.964" BP '58.932" 68047'43.227" BP '57.741" 68 47'43.979" BP '55.923" 68 47'44.661" BP '55.249" 68 47'45.979" BP '52.363" 68 47'47.475"

7 BP '43.354" 68 47'22.058" BP '53.957" 68 47'19.364" BP '57.674" 68 47'19.792" BP '7.538" 68 47'30.826" BP '10.02" 68 47'30.776" BP '14.1" 68 47'29.844" BP '20.267" 68 47'28.186" BP '18.352" 68 47'21.155" BP '15.645" 68 47'18.507" BP '15.459" 68 47'17.879" BP '23.3" 68 47'13.455" BP '36.337" 68 47'7.074" BP '42.562" 68 47'27.038" BP '42.122" 68 47'33.763" BP '34.62" 68 47'36.827" BP '29.822" 68 47'40.198" BP '33.738" 68o47'42.079" BP '32.836" 68047'46.141" BP '30.619" 68 47'47.176" BP '30.696" 68 47'48.304" BP '34.953" 68 47'47.896" BP '34.392" 68 47'52.466" BP '28.878" 68 47'53.218" BP '26.531" 68 47'52.452" BP '22.688" 68 47'53.98" BP '22.303" 68 47'54.376" BP '20.393" 68 47'56.336" BP '19.221" 68 47'54.098" BP '16.726" 68 47'52.61" BP '16.081" 68 47'53.3" BP '13.715" 68 47'55.832" BP '12.557" 68 47'55.442" BP '13.228" 68 48'1.387" BP '11.597" 68 48'2.022" BP '10.806" 68 48'3.414" BP '11.685" 68 47'57.538" BP '10.857" 68 47'54.986" BP '3.626" 68 47'49.866" BP '10.857" 68 47'54.986" BP '3.626" 68 47'49.866" BP '24.863" 68 47'44.091" BP '26.087" 68 47'46.983"

8 BP '27.293" 68 47'46.882" BP '27.97" 68 47'49.35" BP '30.329" 68 47'49.83" BP '26.127" 68 47'43.747" BP '24.999" 68 47'40.913" BP '21.635" 68 47'39.714" BP '14.518" 68 47'32.036" Accessibility Nearest rail head Road Airport Port Power Bhuj State Highways and two lane metalled roads connecting the block area with Ahmedhabad via Bhuj. Rudra Mata Domestic Airport, Bhuj (100km) Kandla Port near Gandhidham (170km) Akrimota Thermal Power Project of GMDC at Nani Chher Village in Lakhapat Taluka Hydrography Local drainage Rivers East/South east Climate Average rainfall ( June-September) Temperature (winter - max and min) Temperature (summer - max and min) 100 mm 35 0 C and 8 0 C 40 0 C and 22 0 C Topography Toposheet Number Nature of surface 41 A/15 (F42C15 of Open Series) Gently rolling terrain sloping towards south east; Terrain rises up towards NE and SW. Cadastral Summary Government Land km 2 area (100%) Santhani Land NIL Forest Area NIL Exploration Summary Regional geological mapping (agency, scale) Geological Survey of India; Scale - 1: Regional exploration Agency (RRAS) Commissioner of Geology and Mining, Gujarat

9 Block exploration (agency) Gujarat Mineral Development Corporation Number of drillholes 66 Total metereage 2887 Resource Summary (Mineral Evidence Rule) Resource (UNFC categorisation, tonnage) 68 Mt Average grade 47% CaO Limestone thickness 12m Average OB thickness 5 to 15m on average (35m max in SW) Structure - strike and dip NE-SW/ SE Faults None Figure 1: Location of Goyla Block, Abadasa Taluka, Kachchh District of Gujarat shown above in the Google Earth image.

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