State Unit: Andhra Pradesh Project: Strategic Mineral Name of the Project Supervisor: Mission-IIA Mineral Resource Assessment Item No. NEW ITEM Field Season Year FSP Number ME SR AP 2018 2018-19 Type Code Com/IGC Region Code State Unit Year of Sl. No. code code/Mission Initiation Participating Unit(s)/ Region (s) REE SR AP Geophysics SR Division Region State Division/ Region/ Division Region/ SU Division Region/ SU /Project Unit Project SU /Project /Project Geographic Information State (Code) District code(s) Degree Sheet (s) Toposheet (s) Mineral/ Tectonic Belt, Basin etc. AP Chittoor, 57K 57K/14 PGC-II & Cuddapah Cuddapah Supergroup Personnel 2G Name of item in-charge 1G Name of other officers 1G Title Reconnaissance survey for REE occurrences in Boyapalle-Kottapalle and Nadigadda blocks of Chittoor & Cuddapah districts, Andhra Pradesh.
Stage G4 Key words REE, PGC-II & Cuddapah Super Group Objective (s)/ Projected Outcome i. Delineate To delineate possible sources of REE and Rare Metal ii. To update geological database of the Cuddapah Super Group
Total duration of item Two Years (FS 2018-19 and 2019-20) Item linked with Annual plan of GSI Whether GCM has been done in the area Yes, taken for FS-2015-16 Whether GPM has been done in the area No Whether the item is aspinoff of any otheritem spinoff Whether item is collaborative No Whether the item is sponsored No If yes, Name of the sponsor NA Outsourced work component, if any (specify) NA Nature and quantum of work and time schedule: Total (a) Expected Year of Work Work Work Nature of work Workload completion already proposed propose envisaged (b) Circulation of final completed for FS d for FS report 2018-19 2019-20 01. Aerial Reconnaissance 500 New Item 500 Nil and PGRS (1:50,000) 02. Geological Survey (a) March 2020 LSM (Sq. Km) ^^1: 12,500 200 (b) September 2020 100 100 03. Technological Survey (a) Surface exploration PT (Cum) 100 50 50 04. SMPL: BRS(Nos.) 200 100 100 SS (Nos.) 200 100 100 PTS(Nos) 100 50 50 PS# 50 25 25 PCS^ 50 25 25 EPMA# 20 10 10 06. Chemical Analysis** 560 275 275
# At Petrology lab, SR, Hyderabad; $ + at NCEGR- Bengaluru: ^** At Chemical laboratory, SRO, Hyderabad, ^^ Boundary coordinates and borehole locations to be fixed by DGPS
TIMELINE PROPOSED FOR EACH WORK COMPONENT Field Studies Name of the officer Expected field stay Expected period of fieldwork (number of days) From To 1G 120 April 2018 March 2019 1G 120 April 2018 March 2019 Supervisory Officer 20 April 2018 March 2019
Laboratory Studies Activity From To Pre-field laboratory component and reconnaissance for the April 2018 September 2019 assignment under consideration, finalization of report of the previous field season and planning for current programmes Geological study (fieldwork and collection, processing of samples April 2018 March 2019 and their submission) Geophysical study (consultation of interpreted geophysical data) April 2018 March 2019 Chemical study (last date of sample submission ) 30th April 2019 Chemical study (acquisition of analytical data) April 2018 May 2019
Report Submission Submission of the first draft of report 30th June 2019 Scrutiny of the report by supervisory officer 1stJuly to 31stJuly 2020 Scrutiny of the report by RMH office 1stAugust to 31stAugust 2020 Finalization of the report September 2020 Circulation of the report 30th September 2020
Operational Expenses for one year Heads Geology(Rs) POL Rs. 1,50,000/- WAGES Rs. 3,50,000/- OC Rs. 1,25,000/-
Background Information:
The Study area exposes older metamorphic rocks of Achaean age and Peninsular Gneissic Complex II rocks of Achaean to Palaeo-Proterozoic age and followed by basic intrusives of Paleo- Proterozoic age. The older metamorphic rocks composed of amphibolite occur in the area as xenoliths within the grey hornblende-biotite granite gneiss in a limited part around Adivipalle (13° 44' 05"; 78° 57' 50") in the northeastern corner. These rocks are exposed in this part as isolated patches. The PGC-II rock unit occupies the larger part of the area. This unit consists of hybrid granite gneiss, grey hornblende-biotite granite gneiss, grey biotite granite gneiss, porphyritic biotite granite, porphyritic grey granite and quartz vein. The basic intrusives (dolerite) cut across all the litho units of PGC-II rocks. Hybrid granite gneiss is the most dominant rock type in the PGC and occupies the larger part of the area. Generally the rock is greenish grey in colour, coarse grained and composed of biotite, plagioclase, hornblende and quartz. Grey hornblende-biotite granite gneiss is exposed in the northern part of area between west of Rangnadhapuram (13° 44' 10"; 78° 46' 25") to west of Kuppam-Varipalle (13° 44' 35"; 78° 54' 00"). This rock occupies a limited part of the area. Generally, the rock is grey to whitish grey in colour, bouldery, medium to fine grained and composed of quartz, K-feldspars, biotite, hornblende and plagioclase feldspars. Grey biotite granite gneiss is exposed in the eastern part of the area between Sorakayalapeta in the north and Kolluru in the southeast. This rock is composed of Quartz, K-feldspars, hornblende and plagioclase feldspars. Grey hornblende granite occupies the eastern part within hybrid granite gneiss between the area of southeast of Pileru to Gantavaripalle (13° 31' 00"; 78° 58' 10") in the southeastern part. This rock is also exposed around Reddivaripalle (13° 44' 50"; 78° 54' 40"), east of Medikurti (13° 42' 25"; 78° 46' 30") and around Pallavolu (13° 43' 50"; 78° 47' 20") in the northern part as isolated patches. Porphyritic biotite granite occupies as small isolated patches around northeast of Regallu (13° 36' 30"; 78° 53' 20"), east of Chadumu (13° 32' 50"; 78° 54' 30") in the central part and also exposed at southwest of Reddivaripalle (13° 38' 20"; 78° 47' 50") in the western part of the area. The Porphyritic grey granite is exposed around west of Erradaddivaripalle (13° 42' 50"; 78° 55' 00") in hybrid granite gneiss as a isolated exposure. The quartz veins traverse the PGC-II unit with varying lengths. Generally the veins are white to light rose and trend in NE-SW, E-W and NW-SE directions. Basic intrusives of dolerite composition cut across the PGC-II unit and older metamorphics. These dykes are medium to fine grained in nature and broadly strike in E-W, NW-SE, N-S and NE-SW directions. The length of the dykes varies from few meters to more than 3 to 4 kilometers. C. Rama Mohan et al. during F. S: 1983 – 84 carried out systematic geological mapping in scale 1: 63, 360/1: 50,000 in parts of Chinnagotigallu, Bangarupalem, Vayalpad, Ledanpalle, Thambalapalle and Pungunuru Taluks falling in survey of India T. S. nos. 57 K/5, 6, 7, 9, 13 14 and 15. Ch Durga Rao during F. S. 2004 – 05 carried out mapping of an area of 100 sq. km on 1:50,000 scale in parts of Toposheet No. 57 K/13 and K/14 in and around Vagalla in Chittoor Districts, A. P. The work included collection of 100 water samples for chemical analysis. The mapping near Vagalla and surrounding areas brought to light presence of five high anomaly zones of radiation in the granitic rocks of the area whereas basic dykes, quartz veins and aplites showed very low radiation. Sharma, K. J. during F. S. 1989 – 90 carried out studies of mafic dyke swarms in parts of Chittoor District in T. S. No. 57K/10 and 57K/14.He also made a comparative study of the dyke swarms of Chittoor and Mahaboobnagar Districts. Plots of major element analyses on various discrimination diagrams have revealed a tholeiitic and sub-alkaline composition of the magma. In contrast to the
Mahaboobnagar dykes the dykes of the present study show low K2O, CaO/Al2O3 and high Na2O/K2O and high Sugimura index suggesting the emplacement in deeper crustal levels. The REE patterns of dykes of Mahaboobnagar area characterize LREE enrichment and HREE depletion. G. Suresh et. al. during F. S. 2006 – 07 carried out petrographic studies of Pulikonda alkaline complex within Tsundupalle schist belt, Cuddapah and Chittoor districts, A.P in T.S.No. 57 K/13 and 14. According to them the Pulikonda syenite shows moderate fractionation between LREE and HREE as reflected by enrichment of HREE and moderate enrichment of LREE. The –ve Eu anomaly indicates role of plagioclase fractionation. Three distinct coeval primary magmas i.e. mafic syenite, felsic syenite and alkali basalt magmas –all derived from low degrees of partial melting of mantle differentiates and enriched metasomatised lower crust, played a major role in the genesis and emplacement of the syenites into overlying crust along deep seated regional scale trans-lithospheric strike-slip faults and shear zones following immediately after late- Archaean calc-alkaline arc magmatism at different time-space episodes i.e. initially at craton margin and later on into the thickened craton interior of the Eastern Dharwar Craton. The ductile sheared and folded Pulikonda syenite complex was evolved dominantly from the magmas derived from partial melting of lower crust and minor juvenile magmas from mantle. Differentiation and fractionation by liquid immiscibility of mafic magma and mingling-mixing of intermediate and felsic magmas followed by fractionational crystallization under extensional tectonics during waning stages of calc – alkaline arc magmatism nearer to the craton margin were attributed as the main processes for the genesis of Pulikonda syenite complex. B.J.Barman et. al 2015-16, an area of 820 sq. is mapped geochemically in SoI T. S. No. 57 K/14 and part T. S. no. 57 O/2 covering the Kalikiri, Pileru, Sodum and Pulicherla Taluks of Chittoor District, Andhra Pradesh. The elemental distribution map of the LREE’s (Ce, Gd, Eu, La, Nd, Pr, Sm and Tb) shows that the values higher than the threshold values are concentrated over hybrid granite gneiss along its eastern contact with grey hornblende biotite granite gneiss and in the central part of hybrid granite gneiss. The value of total LREE’s is ranges from 100.07 ppm to 2119.84 ppm. The elemental distribution maps of Ce, Gd, Eu, La, Nd, Pr, Sm and Tb shows strong positive correlation with each other. The HREE’s Y, Lu, Er, and Tm shows positive co – relation and the higher values are concentrated over the grey hornblende biotite granite gneiss in the eastern part of T. S. No. 57 K/14 at three places near Samalavaripalle, Bandakindapalle and Kotapalle and also over hybrid granite gneiss near Anakalamma Konda. The values of total HREE’s are range from 6.81 ppm to 78.84 ppm. The value of total LREE’s and HREE,s are 713ppm, 1913ppm,1299ppm, 658ppm, 496ppm, 672ppm, 498ppm, 2128 ppm in composite cell no. 33 to 40 and 597ppm, 402ppm, 504ppm, 718ppm, 730ppm, 880ppm, 735ppm, 677ppm, 924ppm, 1877ppm & 1761ppm in composite cell nos. 4 to 14. 545ppm, 577ppm, 808ppm, 802ppm, 516ppm, 523ppm & 1358 ppm in composite cell nos. 47 to 53. It is also 1231ppm, 766ppm, 615ppm, 582ppm, 510ppm, and 511ppm, 556ppm in composite cell nos. 61 to 67 and 1215, 1302 & 665ppm in composite cell nos. 05 to 07. In the view of above observation indicating the presence of REE mineralization in the Boyapalle- Kottapalle and Nadigadda blocks of Cuddapah and Chittor districts a G-4 stage mineral investigation is proposed in the proposed area (Toposheets No. 57K/14) for FS 2018-19 and FS19-20 with an objective to delineate zones of REE minersalisation and establish the mineral potentiality
The details of three blocks are given below: S.no. Name of Blocks Longitude Latitude 1 Boyapalle block 780 51’ 40” to 780 56’ 6.0” 130 36’ 41” to 130 38’ 40” 2 Kottapalle block 780 49’ 26” to 790 00’ 130 32’ 12” to 130 35’ 25.80” 3 Nadigadda block 780 48’ 19” to 790 00’ 130 30’ to 130 31’ 45.80”
References: 1. Barman, B. J. (2015), Geochemical mapping in parts of Cuddapah and chittor districts, Andhra Pradesh (T. S. Nos. 57 K/14 and part of 57 O/2). Unpublished GSI report for F.S. 2015 – 16. 2. Durga Rao Ch. (2006). Geoenvironmental appraisal in and around Vagalla village, Chittoor District, Andhra Pradesh A.P. Unpublished GSI report for F.S. 2004-05. 3. Rama Mohan C., Sharma S.K., Gangopadhyay and Ganguly R. 1982. Report on the systematic geological mapping of parts of Chittoor dist., A.P. Unpublished GSI report for F.S. 1980-81. Pp. 12. 4. Suresh G. and Ghosh Subhashish, (2008). Detailed petrographic and petrochemical studies of aegirineriebeckite syenite bodies a) Pulikonda alkaline complex within Tsundupalle Schist Belt, Cuddapah and Chittoor Districts, A.P and b) Dancherla Alkaline Complex, Gooty area, Anantapur District, A.P. A.P. Unpublished GSI report for F.S. 2006-07. 5. Sharma, K. J. (1990). Studies of mafic dyke swarms of parts of Chittoor District, Andhra Pradesh. Unpublished GSI report for F.S. 1989 – 90.