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Report No. 7 Report No. 7 Report No. 7 Report No. 7
ReportReport No.No. 77
ReportNo. 7
MINISTRYMINISTRYMINISTRY OFOFOF ENVIRONMENTENVIRONMENTENVIRONMENT ANDANDAND NATURALNATURALNATURAL RESOURCESRESOURCESRESOURCES
MINISTRY OF ENVIRONMMINISTRY OF ENVIRONMMINISTRY OF ENVIRONMMINISTRY OF ENVIRONMENT AND NATENT AND NATENT AND NATENT AND NATURAL REURAL REURAL REURAL RESSSSOOOOURCES URCES URCES URCES
MINESMINES ANDAND GEOLOGICALGEOLOGICAL DEPARTMENTDEPARTMENT
MINES AND GEOLOGICAL DEMINES AND GEOLOGICAL DEMINES AND GEOLOGICAL DEMINES AND GEOLOGICAL DEPARTMPARTMPARTMPARTMEEEENT NT NT NT
MINESANDGEOLOGICALDEPARTMENT
SURVEYSURVEYSURVEY
GEOLOGICAL SURVEY GEOLOGICAL SURVEY GEOLOGICAL SURVEY GEOLOGICAL SURVEY
GEOLOGICALGEOLOGICALGEOLOGICAL
OF OF OF OF
OFOFOF
No. 2 MINING AREA, KAVIRONDO No. 2 MINING AREA, KAVIRONDO No. 2 MINING AREA, KAVIRONDO No. 2 MINING AREA, KAVIRONDO
No.No.No. 222 MININGMININGMINING AREA,AREA,AREA, KAVIRONDOKAVIRONDOKAVIRONDO
InterimInterimInterim ReportReportReport andandand MapMapMap ofofof thethethe South-WestSouth-WestSouth-West QuadrantQuadrantQuadrant
InterimInterim Report and Map of the South-W Report and Map of the South-Weest Quast Quaddrant rant
InterimInterim Report and Map of the South-W Report and Map of the South-Weest Quast Quaddrant rant
by by by by
bybyby
WILLIAMWILLIAMWILLIAM PULFREY,PULFREY,PULFREY, M.Sc.,M.Sc.,M.Sc., Ph.D.,Ph.D.,Ph.D., F.G.S.F.G.S.F.G.S.
WILLIAM PULFREY, M.Sc., Ph.D., F.G.S. WILLIAM PULFREY, M.Sc., Ph.D., F.G.S. WILLIAM PULFREY, M.Sc., Ph.D., F.G.S. WILLIAM PULFREY, M.Sc., Ph.D., F.G.S.
AssistantAssistantAssistant GeologistGeologistGeologist
Assistant Geologist Assistant Geologist Assistant Geologist Assistant Geologist
FirstFirstFirst printprintprint 193819381938
First print 1938 First print 1938 First print 1938 First print 1938
ReprintReprintReprint 200720072007
Reprint 2007 Reprint 2007 Reprint 2007 Reprint 2007
GEOLOGICAL SURVEY GEOLOGICAL SURVEY GEOLOGICAL SURVEY GEOLOGICAL SURVEY
GEOLOGICALGEOLOGICALGEOLOGICAL SURVEYSURVEYSURVEY
OF OF OF OF
OFOFOF
No. 2 MINING AREA, KAVIRONDO No. 2 MINING AREA, KAVIRONDO No. 2 MINING AREA, KAVIRONDO No. 2 MINING AREA, KAVIRONDO
No.No.No. 222 MININGMININGMINING AREA,AREA,AREA, KAVIRONDOKAVIRONDOKAVIRONDO
InterimInterimInterim ReportReportReport andandand MapMapMap ofofof thethethe South-WestSouth-WestSouth-West QuadrantQuadrantQuadrant
InterimInterimInterimInterim Report and Map of the South-W Report and Map of the South-W Report and Map of the South-W Report and Map of the South-Weeeest Quast Quast Quast Quaddddrant rant rant rant
by by by by
bybyby
WILLIAMWILLIAMWILLIAM PULFREY,PULFREY,PULFREY, M.Sc.,M.Sc.,M.Sc., Ph.D.,Ph.D.,Ph.D., F.G.S.F.G.S.F.G.S.
WILLIAM PULFREY, M.Sc., Ph.D., F.G.S. WILLIAM PULFREY, M.Sc., Ph.D., F.G.S. WILLIAM PULFREY, M.Sc., Ph.D., F.G.S. WILLIAM PULFREY, M.Sc., Ph.D., F.G.S.
AssistantAssistantAssistant GeologistGeologistGeologist
Assistant Geologist Assistant Geologist Assistant Geologist Assistant Geologist
CONTENTSCONTENTSCONTENTS
I—INTRODUCTIONI—INTRODUCTIONI—INTRODUCTION
II—PREVIOUS
II—PREVIOUSII—PREVIOUS WORKWORK
WORK
III-TOPOGRAPHYIII-TOPOGRAPHYIII-TOPOGRAPHY
IV—SUMMARYIV—SUMMARYIV—SUMMARY 0F0F0F GEOLOGY,
GEOLOGY,GEOLOGY, GEOLOGICALGEOLOGICALGEOLOGICAL SUCCESSIONSUCCESSIONSUCCESSION ANDANDAND
CORRELATIONCORRELATIONCORRELATION
V—DETAILSV—DETAILSV—DETAILS 0F0F0F GEOLOGY:—GEOLOGY:—GEOLOGY:—
1.1.1. BasementBasementBasement ComplexComplexComplex ...
2.2. Pre-KavirondoPre-Kavirondo VolcanicVolcanic SeriesSeries
2. Pre-Kavirondo Volcanic Series llllll
1(a)Rhyolites1(a)Rhyolites andand Sub-AcidSub-Acid LavasLavas
1(a)Rhyolites and Sub-Acid Lavas llllll
(b)(b) AndesiticAndesitic LavasLavas
(b) Andesitic Lavas 131313
(c) Basalts . . . . . . . . . .
(c)(c) BasaltsBasalts .. .. .. .. .. .. .. .. .. .. l)l)l)
(d)Pyroc1astic Types and Conglomerates .. .
(d)Pyroc1astic(d)Pyroc1astic TypesTypes andand ConglomeratesConglomerates .... .. 171717
(e)(e)(e) ConditionsConditionsConditions ofofof depositiondepositiondeposition ofofof thethethe volcanicvolcanicvolcanic rocksrocksrocks
3.3. NoteNote onon thethe KavirondoKavirondo SeriesSeries 191919
3. Note on the Kavirondo Series
4. Tertiary . . . 20
4.4. TertiaryTertiary .. .. .. 2020
5.5.5. PleistocenePleistocenePleistocene andandand RecentRecentRecent DepositsDepositsDeposits 222222
6. Major Intrusive Igneous Rocks I. 242424
6.6. MajorMajor IntrusiveIntrusive IgneousIgneous RocksRocks I.I.
(a) Granites of Nyarodi type:—
(a)(a) GranitesGranites ofof NyarodiNyarodi type:—type:—
Abom,Abom,Abom, Tedo,Tedo,Tedo, KayamoKayamoKayamo Island,Island,Island, etc.etc.etc. 252525
(b)(b)(b) GranitesGranitesGranites ofofof AsemboAsemboAsembo type:—type:—type:—
Asembo and Ndeda Island
AsemboAsembo andand NdedaNdeda IslandIsland 282828
(c)Abiru Granite 31
(c)Abiru(c)Abiru GraniteGranite 3131
Igneous RocksRocksRocks
7.7.7. MinorMinorMinor IntrusiveIntrusiveIntrusive IgneousIgneous 333333
(a)(a)(a) AcidAcidAcid andandand Sub-AcidSub-AcidSub-Acid TypesTypesTypes 333333
(b)(b)(b) IntermediateIntermediateIntermediate TypesTypesTypes 363636
(c)(c)(c) BasicBasicBasic typestypestypes andandand lamprophyreslamprophyreslamprophyres 383838
8.8.8. MetamOrphismMetamOrphismMetamOrphism 414141
VI—TECTONICSVI—TECTONICSVI—TECTONICS
RESOURCES
MINERAL RESOURCESRESOURCES
AND MINERALMINERAL
VII—ECONOMICSVII—ECONOMICSVII—ECONOMICS ANDAND
1. Geology of the Gold Deposits
1.1. GeologyGeology ofof thethe GoldGold DepositsDeposits 333233323332
.. ... ...
Occurrences ....
the GoldGoldGold OccurrencesOccurrences
2.2.2. DescriptionDescriptionDescription ofofof thethe
VIII—BIBLIOGRAPHYVIII—BIBLIOGRAPHYVIII—BIBLIOGRAPHY 636363
I—INTRODUCTIONI—INTRODUCTION
I—INTRODUCTION
The
TheThe areaarea
area describeddescribeddescribed inin
in thisthisthis reportreportreport comprises
comprisescomprises thethethe SakwaSakwaSakwa
Location
LocationLocation andandand partpartpart ofofof thethethe AsemboAsemboAsembo LocationLocationLocation of
ofof Central
CentralCentral Kavi-Kavi-Kavi-
rondo. It is bounded on the north by the River Yala, on the
rondo.rondo. ItIt isis boundedbounded onon thethe northnorth byby thethe RiverRiver Yala,Yala, onon thethe
easteasteast bybyby aaa truetruetrue north~southnorth~southnorth~south linelineline runningrunning throughthrough aa pointpoint aboutabout
running through a point about
0.40.40.4 milesmilesmiles easteasteast of
ofof AnyangoAnyangoAnyango T.S.,1T.S.,1
T.S.,1 on
onon thethethe westwestwest byby
by the
thethe shoreshoreshore
ofofof LakeLakeLake Victoria,Victoria,Victoria, andandand ononon thethethe southsouthsouth byby thethe shoreshore ofof thethe
by the shore of the
KavirondoKavirondoKavirondo GulfGulfGulf andandand aaa linelineline runningrunningrunning acrossacrossacross thethe basebase ofof thethe
the base of the
UyomaUyomaUyoma Peninsula.Peninsula.Peninsula. TheTheThe area,area,area, whichwhich
which forms
formsforms thethe
the South-WestSouth-WestSouth-West
QuadrantQuadrantQuadrant ofofof thethethe No.No.No. 222 Area
AreaArea ofofof the
thethe KitsonKitsonKitson ReportReport
Report (8)2,(8)2,(8)2, isisis
approximatelyapproximatelyapproximately 230230230 squaresquaresquare miles
milesmiles in
inin extent.extent.
extent. The
TheThe wholewholewhole ofof
of thethe
the
areaareaarea isisis included
includedincluded ininin thethe
the KarunguKarunguKarungu Sheet,Sheet,Sheet, Africa,Africa,Africa, South
SouthSouth AA
A 36/36/36/ E,E,E,
publishedpublishedpublished ininin 191619161916 ononon thethethe scale
scalescale ofofof 11
1 :250,000.:250,000.
:250,000.
WW
W \\
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J///~J///~ ggg .'.'.'
‘3'‘3'‘3'£3£3£3 mum;mum;mum; ///
/T"/T"
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VO/rakameya.\VO/rakameya.\VO/rakameya.\
60/1":60/1":60/1":
NE.NE.NE. ééé 9-“9-“9-“ LLL
141141141 ”la/mm“”la/mm“”la/mm“ ... QUADRA~T3QUADRA~T3QUADRA~T3 \\\
N.W.N.W.N.W. ”1/2”1/2”1/2
AAA ADRANADRANADRAN
//
AkorraAkorraAkorra ___ /
\\\ III ___ III [Kano/a[Kano/a[Kano/a 0°0°
1),1),1), ,7.,7.,7. 0°
2.2.2. Ya/
Ya/Ya/ 13/“13/“13/“ Ava/anAva/anAva/an
((( IIHIHIIIIHIHIIIIHIHII QudELmTQudELmTQudELmT Mac/maMac/ma
Mac/ma
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0
00 “J1““J1““J1“ ooo aaa
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Uyoma.Uyoma.Uyoma.
333 Sea/eSea/eSea/e /:/,ooo,ooo/:/,ooo,ooo/:/,ooo,ooo
{{{
44°44°44°
FIG.
FIG.FIG. 111
showingshowing thethethe
Colony, showing
KenyaKenya Colony,Colony,
SketchSketchSketch mapmapmap ofofof NorthNorthNorth andandand CentralCentralCentral Kavirondo,Kavirondo,Kavirondo, Kenya
in thisthisthis
dealt withwithwith inin
2 MiningMiningMining Area.Area.Area. TheTheThe South-WestSouth-WestSouth-West Quadrant,Quadrant,Quadrant, dealtdealt
positionposition ofofof No.No.No. 22
position
report,report,report, isisis shaded.shaded.shaded.
111 T.ST.ST.S (s).=Trigonometrical(s).=Trigonometrical(s).=Trigonometrical Station(s).Station(s).Station(s).
listedlisted underunderunder SectionSectionSection VIIIVIIIVIII “Bibliw“Bibliw“Bibliw
referrefer tototo literatureliteratureliterature listed
(21)(21) refer
to (21)
222 NumbersNumbersNumbers (1)(1)(1) toto
emphy".emphy".emphy". '''
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