More Highgrade for Oromin
OROMIN Suite 2000, Guinness Tower, 1055 West Hastings Street, Vancouver, B.C. Canada V6E 2E9
EXPLORATIONS LTD. Tel: (604) 331-8772 Toll-free (877) 529-8475
Fax: (604) 331-8773 E-mail: info@oromin.com
June 2, 2010 Trading Symbol: TSX – OLE
OTC/BB – OLEPF
Web Site: www.oromin.com
EXPLORATION DRILLING CONTINUES TO GENERATE EXCELLENT
RESULTS FROM NUMEROUS GOLD DEPOSITS AND TARGETS
HIGHLIGHTS
GOLOUMA STYLE HIGHER GRADE DEPOSITS AND TARGETS
o Kourouloulou Deposit returns 58.79 g/t gold over 4 metres in DH-673 and 73.89 g/t gold
over 3 metres in DH-653
o Koulouqwinde Target returns 7.26 g/t gold over 3 metres in RC-707 and 260.0 g/t gold
over 1 metre in DH-633
MASATO STYLE BULK-TONNAGE DEPOSITS AND TARGETS
o Masato Deposit returns 1.81 g/t gold over 12 metres and 6.67 g/t gold over 4 metres at
depth in DH-736
o Maki Medina Deposit returns 2.58 g/t gold over 20 metres in DH-700 and 1.74 g/t gold
over 40 metres and 1.61 g/t gold over 25 metres in RC-710
o Niakafiri Southeast Deposit returns 1.59 g/t gold over 10 metres in DH-632; 1.52 g/t
gold over 18 metres in DH-642; and 1.82 g/t gold over 10 metres and 1.64 g/t gold over
10 metres in DH-696
o Kobokoto South Target returns 1.58 g/t gold over 5 metres in RC-716
o Initial drilling results from the Niakafiri Southwest Target, including 1.01 g/t gold over
42 metres in RC-645, may represent a future heap leach opportunity
FEASIBILITY STUDY PROGRESSING ON-SCHEDULE FOR RELEASE IN JULY 2010
Oromin Explorations Ltd. (“Oromin”), on behalf of Oromin Joint Venture Group Limited (“OJVG”),
is pleased to provide an update on its ongoing exploration and resource drilling program at its OJVG
Gold Project in eastern Sénégal, West Africa.
Exploration drilling undertaken since the completion of all requisite Feasibility Study geotechnical
and hydrological drilling in early 2010 continues to generate excellent results at many of the OJVG
Page 2 of 8
deposits and targets. With the exception of some results from Kourouloulou, none of these
favourable results are incorporated in the production schedule proposed in OJVG’s forthcoming
Feasibility Study and as a result they will not be included in the Feasibility Study’s economic and
cash flow analyses. Positive impacts from 2010 exploration drilling to date include expansions at
Golouma style higher grade deposits and targets (Kourouloulou and Koulouqwinde), expansions at
Masato style bulk-tonnage deposits (Maki Medina, Niakafiri Southeast and Masato) as well as new
discoveries (Kobokoto South and Niakafiri Southwest).
One of the most interesting 2010 exploration results is the higher-grade interval of 6.67 g/t gold over
4 metres obtained at depth in DH-736 at the Masato Deposit. This hole targeted mineralization
approximately 50 metres beneath the optimized pit shell used to constrain the current resource,
where it not only intersected and confirmed continuity of the bulk-tonnage mineralization (1.81 g/t
gold over 18 metres) but also intersected a second higher-grade style of mineralization (6.67 g/t gold
over 4 metres).
The favorable intersection of bulk-tonnage mineralization at depth in DH-736 may enable the
current optimized pit shell to be deepened as this mineralization continues to demonstrate grade and
width continuity with that intersected above. In addition, the confirmation of the extension of
higher-grade style mineralization in DH-736, together with the higher-grade intersections
encountered in previous drilling, provides OJVG the opportunity to now consider underground
mining opportunities at the Masato Deposit beneath the current planned open pit. This would be the
first potential underground mining opportunity within one of the many OJVG bulk tonnage deposits.
The potential impact of this deep, higher grade mineralization will not be reflected in the upcoming
Feasibility Study.
Other than the results for DH-641 and DH-653 at the Kourouloulou Deposit, none of the results in
the following tables have been incorporated into the 2010 Feasibility Study, but most of these results
will be incorporated in a separate resource estimate update anticipated in July. OJVG plans to
continue exploration drilling throughout the remainder of 2010.
KOUROULOULOU DEPOSIT
Kourouloulou is a Golouma style higher grade deposit located approximately 500 metres north of the
Golouma South Deposit and 1,000 metres south of the Kerekounda Deposit (two of several other
Golouma style higher grade deposits). Kourouloulou is comprised of two principal, sub-parallel
gold veins traced to date by drilling across a 220-metre strike extent and currently to a depth of
approximately 300 metres. The Kourouloulou Deposit remains open to expansion to depth and to
the west. Initial resources for this new discovery will be included in the feasibility study report
scheduled for public release in early July.
Results listed below for DH-673 and DH-680 arrived after that data cut-off date for inclusion in the
Feasibility Study analysis, but will be incorporated in future resource updates.
Kourouloulou Deposit
Drill Hole
Grid
Co-ordinate
Azimuth/
Dip
From – To
(m)
Interval
(m)
Gold
(g/t)
DH-641 53493N/5413E 030/-55 82-84 2 19.74
Page 3 of 8
Kourouloulou Deposit
Drill Hole
Grid
Co-ordinate
Azimuth/
Dip
From – To
(m)
Interval
(m)
Gold
(g/t)
DH-653 53513N/5327E 030/-55 109-112
incl.111-112
3
1
73.89
209.7
DH-673 53482N/5385E 030/-65 235-239
incl.237-238
4
1
58.79
229.0
DH-680 53482N/5385E 030/-75 141-142 1 22.98
KOULOUQWINDE TARGET
Koulouqwinde is outlined by a 700 metre by 300 metre gold-in-soil geochemical anomaly that lies
within the Golouma style higher grade structural trend approximately 1,000 metres southwest of the
Golouma South Deposit. Drilling to date has intersected various styles of mineralization including
shear-hosted altered quartz veining, inter-shear dilational quartz veining and, most recently, shallow
dipping altered quartz tourmaline veining occasionally displaying visible gold.
A resource calculation has not yet been undertaken for Koulouqwinde, nor have these results been
included in the 2010 Feasibility Study. The initial resource evaluation for Koulouqwinde will begin
shortly for inclusion in a project-wide resource update to follow the upcoming release of the
Feasibility Study.
Koulouqwinde Target
Drill Hole
Grid
Co-ordinate
Azimuth/
Dip
From – To
(m)
Interval
(m)
Gold
(g/t)
DH-489 * 52480N/4480E 160/-50 50-52 2 8.64
RC-642 * 52625N/4390E 045/-50 141-143
147-148
2
1
6.16
41.99
RC-644 * 52365N/4485E 340/-55 74-79 5 6.78
incl. 74-76 2 13.15
RC-648 * 52365N/4485E 340/-68 16-19 3 5.18
RC-649 * 52380N/4525E 340/-50 74-77
incl.74-75
3
1
13.13
29.46
RC-653 * 52705N/4418E 220/-50 156-157 1 96.45
RC-655 * 52382N/4480E 015/-50 48-55
143-144
7
1
14.24
30.86
DH-633 52437N/4452E 140/-45 100-101 1 260.0
DH-647 52297N/4281E 140/-45 86-89
incl.86-87
3
1
2.76
7.13
DH-665 52296N/4214E 110/-50 131-133 2 3.65
DH-675 52661N/4359E 110/-50 151-155 4 1.55
DH-683 52620N/4347E 110/-50 128-129 1 10.70
RC-707 52332N/4230E 110/-50 48-51
72-80
incl.76-78
3
8
2
7.26
2.15
4.40
RC-708 52256N/4197E 110/-50 0-5
incl.0-2
5
2
1.83
4.08
* Previously Released
Page 4 of 8
MASATO DEPOSIT
A total of three drill holes were recently completed in an area of the Masato Deposit to confirm that
the bulk-tonnage style of mineralization comprising the majority of the deposit continues at depth
beneath the optimized pit shell used to constrain the current resources and may ultimately justify
deepening the open pit at Masato. In addition, these holes, combined with previous high grade
results, suggest that multiple shoots of Golouma style higher grade mineralization may be present to
considerable depth beneath the resource pit shell as well. This is the first indication that the higher
grade Golouma style of mineralization may be present within the Masato style bulk tonnage gold
deposits.
Based on these results, especially those from DH-736, future drilling will continue evaluating both
styles of mineralization in this portion of the Masato Deposit which remains open to expansion to
depth and to the northeast.
Masato Deposit
Drill Hole
Grid
Co-ordinate
Azimuth/
Dip
From – To
(m)
Interval
(m)
Gold
(g/t)
DH-293* 59645N/4484E 110/-80 191-194 3 17.94
DH-312* 59659N/4447E 110/-80 183-195 12 17.26
DH-473* 59524N/4550E 110/-50 36-38 2 48.54
RC-292* 59782N/4618E 110/-75 111-120 9 8.92
RC-362* 59837N/4580E 110/-50 162-170 8 14.12
RC-469* 59285N/4584E 110/-60 0-5 5 7.30
DH-723 60175N/4716E 104/-70 249-293
incl.249-257
44
8
1.04
2.07
DH-736 60225N/4749E 104/-70 240-250
incl.240-243
295-307
335-341
incl.337-341
10
3
12
6
4
1.05
2.10
1.81
5.24
6.67
* Previously released
MAKI MEDINA DEPOSIT
Maki Medina is a Masato style bulk-tonnage deposit located 2 kilometres southeast of the Niakafiri
Southeast Deposit. The initial resource calculated for Maki Medina in May 2009 provided an
inferred resource of 1.5 million tonnes grading 1.50 g/t gold or 70,000 ounces of gold. This initial
resource estimation was based on limited, shallow and widely-spaced drilling over a 900-metre
strike extent. Since the initial resource calculation, drilling has been completed over a 1,600-metre
strike extent with the majority of this trend covered by 40-metre drill spacing and to greater depths
along the drilled Sections. The drilling completed thus far in 2010 continues to intersect similar
resource grades as well as some broader zones of mineralization.
While the initial inferred resource total for Maki Medina is in the upcoming Feasibility Study, none
of the 2010 results will be included. A revised resource update is now under way for the Maki
Medina Deposit for inclusion in the property-wide update to follow the release of the Feasibility
Study.
Page 5 of 8
Maki Medina Deposit
Drill Hole
Grid
Co-ordinate
Azimuth/
Dip
From – To
(m)
Interval
(m)
Gold
(g/t)
DH-637 53592N/2049E 110/-50 74-79 5 1.90
DH-652 53555N/2034E 110/-72 56-60
incl.58-59
4
1
4.21
9.81
DH-659 53349N/1861E 110/-50 19-23
124-128
4
4
3.64
3.02
DH-664 53454N/2006E 110/-70 78-83
105-118
incl.113-116
5
13
3
4.87
1.22
2.69
DH-667 54222N/2100E 110/-60 92-99
incl.95-98
7
3
2.66
5.10
DH-669 54236N/2183E 110/-60 20-24
incl.22-24
4
2
4.34
7.80
DH-670 54134N/2008E 110/-50 122-126 4 2.20
RC-694 53399N/2035E 110/-50 34-39
incl.36-37
5
1
1.84
5.69
RC-696 53629N/2053E 110/-80 62-69
incl.62-64
7
2
1.78
4.22
RC-700 54164N/2031E 110/-60 103-123
incl.104-108
20
4
2.58
5.66
RC-702 53967N/1984E 110/-60 124-133 9 1.21
RC-710 52874N/1743E 110/-50 64-154
incl.110-150
incl.135-142
186-211
incl.192-207
90
40
7
25
15
1.02
1.74
2.84
1.61
2.18
NIAKAFIRI SOUTHEAST DEPOSIT
Niakafiri Southeast is a Masato style bulk-tonnage deposit located approximately 3 kilometres
southwest of the Masato Deposit. The initial resource calculated for Niakafiri Southeast in May
2009 provided an inferred resource of 4.35 million tonnes of 0.90 g/t gold or 119,000 ounces of
gold. Since that initial resource calculation was undertaken, considerable additional step-out and in
fill drilling has occurred, predominantly beyond the previous northern drilled limit where a further
300 metres of strike extent has been one of the areas of focus, and also the previously sparsely
drilled southernmost 200 metre extent of the deposit is now being extensively drilled.
While the initial inferred resource total for Niakafiri Southeast is in the upcoming Feasibility Study,
none of the 2010 results will be included. A revised resource update will begin soon for the
Niakafiri Southeast Deposit for inclusion in the property-wide update to follow the release of the
Feasibility Study.
Niakafiri Southeast Deposit
Drill Hole
Grid
Co-ordinate
Azimuth/
Dip
From – To
(m)
Interval
(m)
Gold
(g/t)
DH-629 56054N/3281E 105/-50 91-97 6 1.48
DH-632 56090N/3284E 105/-50 9-13
102-112
4
10
2.04
1.59
Page 6 of 8
Niakafiri Southeast Deposit
Drill Hole
Grid
Co-ordinate
Azimuth/
Dip
From – To
(m)
Interval
(m)
Gold
(g/t)
incl.106-111 5 2.46
DH-635 56082N/3314E 105/-50 0-13
61-70
13
9
1.20
1.42
DH-638 56132N/3283E 105/-50 133-146
incl.137-142
13
5
1.23
1.92
DH-642 56172N/3283E 105/-50 7-15
124-142
8
18
1.49
1.52
DH-643 56214N/3287E 105/-50 2-9 7 1.53
DH-646 55990N/3218E 105/-50 140-147
incl.144-146
7
2
1.65
4.80
DH-648 56069N/3238E 105/-50 9-15 6 1.91
DH-660 56101N/3246E 105/-50 22-28 6 2.07
DH-696 55820N/3222E 105/-50 2-29
incl.12-22
39-44
incl.41-42
61-71
27
10
5
1
10
1.16
1.82
1.98
5.01
1.64
KOBOKOTO SOUTH TARGET
Kobokoto South is situated approximately 2.0 kilometres to the southwest of the Maki Medina
Deposit within the Masato style bulk tonnage structural trend. The initial drill result correlates very
well with trenching results including 1.85 g/t gold over 4 metres, 1.21 g/t gold over 11 metres and
1.91 g/t gold over 9 metres from the initial 300-metre strike length tested by drilling. Observations
in many of the drill holes completed along this 300-metre portion of the Kobokoto South target
identify a fairly continuous, predictable, moderately flat-dipping, shear hosted, oxidized and altered
quartz-vein/quartz stockwork system similar to observations from the trenching excavations.
Additional results for this 300-metre portion of Kobokoto South as well as the remainder of
Kobokoto South are pending.
Kobokoto Target
Drill Hole
Grid
Co-ordinate
Azimuth/
Dip
From – To
(m)
Interval
(m)
Gold
(g/t)
RC-716 51821N/0850E 130/-50 13-22
incl.16-21
9
5
1.04
1.58
NIAKAFIRI SOUTHWEST TARGET
Niakafiri Southwest lies within the Masato style bulk tonnage structural trend, approximately 600
metres to the west of the OJVG Niakafiri Southeast Deposit.
The newly discovered shallow, low grade, oxidized mineralization currently being defined at
Niakafiri Southwest (1.01 g/t gold over 42 metres, 0.43 g/t gold over 68 metres, 0.32 g/t gold over
65 metres) may represent an ore type that is not included in the current proposed development plan
in the Feasibility Study. If a sufficient resource size of this ore type is identified from a number of
the OJVG’s deposits, it could potentially be processed by lower cost heap leaching extraction
Page 7 of 8
method, thereby providing an additional source of concurrent gold revenue not considered in the
Feasibility Study. Previous column leach testwork of a composite sample of oxidized ore from the
Masato Deposit yielded a favourable gold extraction rate of 82%. Over the coming months, OJVG
plans to evaluate this opportunity to add additional value to the project.
Niakafiri Southwest Target
Drill Hole
Grid
Co-ordinate
Azimuth/
Dip
From – To
(m)
Interval
(m)
Gold
(g/t)
RC-645 56201N/2698E 090/-50 0-6
36-47
86-128
incl.86-90
and114-128
132-134
6
11
42
4
14
2
1.59
1.03
1.01
1.57
1.33
3.03
RC-713 56166N/2678E 090/-55 0-6
40-108
incl.40-70
incl.74-79
incl.93-108
6
68
30
5
15
0.58
0.43
0.49
0.78
0.48
RC-715 56132N/2658E 090/-55 9-18
46-111
incl.46-51
incl.62-67
incl.80-83
incl.104-111
9
65
5
5
3
7
0.51
0.32
0.60
0.64
0.73
0.53
Mineralized intervals are based on 1-metre continuous samples utilizing a minimum 1.0 g/t gold cut-off level for
Kourouloulou and Koulouqwinde and a minimum 0.25 g/t gold cut-off level for all other deposits and targets with a
maximum continuous internal dilution of 2 metres with the exception of RC-713 and RC-715. No cutting of gold assays
has been employed for reported intervals. The attitude of mineralized intervals varies and reported mineralized
intersections may not represent true widths.
FEASIBILITY STUDY PROGRESS
In addition to excellent results from its aggressive exploration program, Oromin is pleased that the
Feasibility Study is progressing on-schedule towards a July 2010 release date.
The 2010 Feasibility Study will examine a proposed stand-alone open-pit/underground mine
complex, with initial production from five deposits feeding a central CIL mill. Initial throughput is
planned at 7,400 TPD to process soft oxide and saprolite ores, ramping down to 4,500 TPD during
transition from oxide to harder fresh rock.
OTHER TARGETS
OJVG recently began the drill evaluation of two additional targets on the OJVG Gold Project. The
first of these, the Kinemba Target located 3.5 kilometres south of the Maki Medina Deposit, is a 500
metre by 700 metre gold-in-soil geochemical anomaly with limited hand-trenching that returned 1.11
g/t gold over 8 metres. The second is the Koutouniokolla Target located 1,500 metres northeast of
Kinemba where recent excavator trenching has returned 1.45 g/t gold over 36 metres of bulk-
tonnage style mineralization as well as 16.37 g/t gold over 3 metres and 42.76 g/t gold over 3 metres
of higher grade style mineralization. Drilling results are pending for these two targets.
Page 8 of 8
Doug Turnbull, P. Geo., is a qualified person for the purposes of National Instrument 43-101, and
has verified the data disclosed in this news release. William Bond, P. Geo., is also a qualified
person for the purposes of National Instrument 43-101, and has supervised geologic field
procedures. TSL Laboratories in Saskatoon carried out all assaying under industry-standard
QA/QC procedures.
To find out more about Oromin Explorations Ltd., visit www.oromin.com.
On behalf of the Board of Directors of
OROMIN EXPLORATIONS LTD.
“Chet Idziszek”_________
Chet Idziszek, President
Cautionary Statement
This document contains “forward-looking statements” within the meaning of applicable Canadian securities regulations. All statements other than
statements of historical fact herein, including, without limitation, statements regarding exploration plans and our other future plans and objectives, are
forward-looking statements that involve various risks and uncertainties. Such forward-looking statements include, without limitation, estimates of
exploration investment and the scope of exploration programs. There can be no assurance that such statements will prove to be accurate, and future
events and actual results could differ materially from those anticipated in such statements. Important factors that could cause actual results to differ
materially from our expectations are disclosed in the Company’s documents filed from time to time via SEDAR with the Canadian regulatory agencies
to whose policies we are bound. Forward-looking statements are based on the estimates and opinions of management on the date the statements are
made, and we do not undertake any obligation to update forward-looking statements should conditions or our estimates or opinions change. Forward-
looking statements are subject to risks, uncertainties and other factors, including risks associated with public markets, mineral exploration, price
volatility in the mineral commodities we seek, and operational and political risks. Readers are advised not to place undue reliance on forward-looking
statements.
