Sumatra summary information

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(i) Analytical Methods Used

ELEMENT EXTRACTION DETERMINATION
Cu,Pb,Zn,Co,Ni,Mn,Ag Hot nitric acid AAS
Li,K,Cr,Fe Hot perchloric/hydrofluoric acid AAS
As,Mo Potassium pyrosulphate/HCl Colorimetric
Sn Ammonium iodide/HCl Colorimetric
W Sodium bisulphate Colorimetric

A summary of the analytical methods used in the analysis of the stream sediment samples (summarised from Davis and Hartati, 1991a).

(ii) Quadrangle Areas

Southern Sumatra Quadrangle Areas

Quadrangle Area (km²) Area Sampled (km²) Number of Samples Sampling density (no.per km²) Adjusted sampling density (no.per km²)
Padang (0715) 8,540 6,444 362 23.6 17.8
Solok (0815) 18,453 17,253 1,825 10.1 9.5
Rengat (0915) 17,465 4,326 309 56.5 14.0
Painan&M.Siberut (0714 & 0814) 17,650 15,171 1,869 9.4 8.1
Muarabungo&Jambi (0914 & 1014) 19,735 16,689 912 21.6 18.3
S.Penuh&Ketaun (0813 & 0812) 11,316 8,182 1,049 10.8 7.8
Sarolangun (0913) 18,460 14,962 1,268 14.6 11.8
Palembang (1013) 10,739 4,980 283 37.9 17.6
Bengkulu (0912) 17,645 15,946 1,139 15.5 14.0
Lahat (1012) 11,420 11,012 874 13.1 12.6
Manna (0911) 6,522 4,488 362 18.0 12.4
Baturaja (1011) 18,319 18,134 1,259 14,5 14.4
Kotaagung (1010) 9,315 8,725 726 12.8 12.0
Menggala&T'karang (1111 & 1110) 17,717 12,157 950 18.6 12.8
Total 203,296 158,469 13,187 15.4 12.0

A table summarising the sampling densities for the different quadrangle areas of Southern Sumatra. Padang, Solok, M.Siberut & Painan and S. Penuh & Ketaun are UTM Zone 47. The remaining quadrangles are from UTM Zone 48.

Northern Sumatra Quadrangle Areas

Quadrangle Name dbf Computer filename Number of samples
BANDA ACEH (A) QUADA46.DBF 510
BANDA ACEH (A) QUADA47.DBF 74
LHOKSEUMAWE (B) QUADB.DBF 226
CALANG (C) QUADC.DBF 256
MEULABOH/TAKENGON(D) QUADD.DBF 1530
LANGSA (E) QUADE.DBF 480
TAPAKTUAN (F) QUADF.DBF 326
MEDAN (G) QUADG.DBF 1156
T.TINGGI (H) QUADH.DBF 170
SIDIKALAN (K) QUADK.DBF 633
PEMATANGSIANTAR (L) QUADL.DBF 684
SIBOLGA (N) QUADN.DBF 133
PADANGSIDEMPUAN (P) QUADP.DBF 916
KOTATENGAH/DUMAI(Q) QUADQ.DBF 48
NATAL (T) QUADT.DBF 1334
PAKANBARU (U) QUADU.DBF 433
SIAK SRI INDRAPURA(V) QUADV.DBF 85

Quada46.dbf and Quadc.dbf data are from UTM zone 46 and Quadv.dbf is from UTM zone 48. The rest of the data comes from UTM zone 47.

Summary of Southern Sumatra Regional Geochemical Mapping Project

Area Name: Southern Sumatra
Land Area: 203,296 km²
Date of Sampling:   1980 -1992
 UTM Grid Zones:  47M and 48M
Corner co-ordinates:  
Minimum Longitude 99°E
Maximum Longitude 106°30'E
Minimum Latitude 6°S
Maximum Latitude 0° (Equator)
Drainage Basemap used: Edited 1:250,000 JANTOP TNI(1974) Topographic Maps
Sample Type: Stream sediment
Number of samples collected: 13,187
Sampling density: 1 sample per 15.4 km²
Adjusted sampling density (not incl.swamp, towns, etc): 1 sample per 12.0 km²
Sample fraction analysed: -80#
Chemical analyses: Directorate of Mineral Resources Laboratories, Bandung, Indonesia
 Elements determined:  Cu, Pb, Zn, Co, Ni, Mn, Ag, Li, K, Cr, Fe, As, Sn, Mo , W.