(9 per cent). Remaining 5 per cent resources are in Haryana, Tamil Nadu, Uttarakhand and West
      Bengal. At Degana, Rajasthan, WO3 value in vein deposits varies from 0.13 to 0.80 per cent
      while in gravel deposit, it is, on an average 0.04 per cent. In Sirohi deposit, Rajasthan, WO3
      content ranges from 0.18 to 0.51 per cent.
            The total resources of barytes in India as in 2015 as per UNFC system are placed at 86.7
      million tonnes constituting 59.2 per cent reserves and 40.8 per cent remaining resources. By
      grades, 64 per cent resources are of oil-well drilling grade followed by 6 per cent of chemical
      grade 0.5 per cent of paint grade and 27 per cent constitute low grade. About 2.5 per cent
      resources are of other, unclassified and not-known categories. Andhra Pradesh alone accounts for
      92 per cent of the country’s barytes resources followed by Telangana and Rajasthan.
            Diamond occurrences are reported since prehistoric times in the country. Presently,
      diamond fields of India are grouped into four regions: 1) South Indian tract of Andhra Pradesh,
      comprising parts of Anantapur, Cuddapah, Guntur, Krishna, and Kurnool districtsand
      Mahaboobnagar in Telangana; 2) Central Indian tract of Madhya Pradesh, comprising Panna belt
      and Chhatarpur districts; 3) Behradin-Kodawali area in Raipur district and Tokapal, Dugapal,
      etc. areas in Bastar district of Chhattisgarh; and 4) Eastern Indian tract mostly of Odisha, lying
      between Mahanadi and Godavari valleys.
            As per the UNFC system as in 2015 all India resources of diamond are placed at around
      31.84 million carats. Out of these, 0.96 million carats are placed under reserves category and
      30.87 million carats under remaining resources category. By grades, about 2.38 per cent
      resources are of gem variety, 2.64 per cent of industrial variety and bulk of the resources (95 per
      cent) are placed under unclassified category. By states, Madhya Pradesh accounts for about
      90.18 per cent resources followed by Andhra Pradesh 5.73 per cent and Chhattisgarh 4.10 per
            Dolomite occurrences are widespread in the country. As per UNFC system, as on 1.4.2015
      total resources of dolomite are placed at 8,415 million tonnes, out of which 679 million tonnes
      are placed under reserves category. Major share of about 88 per cent resources was distributed in
      eight states: namely, Madhya Pradesh (27 per cent), Andhra Pradesh (15 per cent), Chhattisgarh
      (11 per cent) Odisha (10 per cent), Karnataka and Rajasthan (7 per cent each), Gujarat (6 per
      cent) and Maharashtra (5 per cent). The remaining 12 per cent resources are distributed in
      Arunachal Pradesh, Jharkhand, Haryana, Sikkim, Tamil Nadu, Uttarakhand, Uttar Pradesh and
      West Bengal.
      Fire Clay
            India possesses substantial reserves of fireclay. The best deposits occur in association with
      the coal seams in the lower Gondwana coalfields of Andhra Pradesh, Jharkhand, West Bengal,
      Madhya Pradesh and Neyveli lignite fields in Tamil Nadu. Notable occurrences of fireclay, not
      associated with coal measures, are reported in Gujarat, Jabalpur region of Madhya Pradesh and
      Belpahar-Sundergarh areas of Odisha. Reserves and resources of fireclay as per UNFC system of
      2015 are estimated at 723 million tonnes. Out of the total resources, Odisha accounts for 24 per