Wassa Gold Mine Q2 2013 Step Out and Infill Drilling Results Continue to Confirm and Extend High Grade Zones

TORONTO–(Marketwired – Jul 18, 2013) -

Highlights of Drill
Program:

• BSDD 262 – 47.1 meters (“m”) grading 7.2 grams per tonne
  (“g/t”) gold 
• BSDD 260 – 62.8 m grading 4.1 g/t
• BSDD 256 – 52.9 m grading 4.3 g/t
• BSDD 285 – 27.9 m grading 5.0 g/t

Golden Star Resources Ltd. (
NYSE MKT:
GSS) (
TSX:
GSC) (
GHANA:
GSR) (“Golden Star” or the “Company”)
today provided an update on exploration activities at its Wassa
gold mine in Ghana. Full drill results, plans, and sections
are available on the Company’s website at
www.gsr.comor by clicking the
following link:

http://www.gsr.com/Operations/Wassa.asp.

As part of the Company’s cost savings measures (see Golden
Star’s June 17, 2013 press release) all contract drills were halted
in the second quarter of 2013. The remaining infill and step out
drilling is being conducted utilizing the Company’s multi-purpose
drill rigs on a single shift. Prior to the contract rigs being
demobilized, a total of 47 drill holes were completed for 14,265 m.
During the second quarter of 2013, drilling continued to infill
large gaps in the existing drilling as well as test the high grade
zone down plunge to the south.

Wassa Drilling:

Drill holes BSDD256 and BSDD260 were both step out holes to the
south testing the high grade zone down the plunge of the Wassa Main
fold. Drill hole BSDD260 drilled 25 m south of the previously
reported (see Golden Star’s April 30, 2013 press release) high
grade zone (42.9 m grading 3.8 g/t) intersected in hole BSDD227, on
section 19700 N, was successful in extending the zone to the south,
intersecting 62.8 m grading 4.1 g/t from 478.5 m. Hole BSDD256
drilled on cross section 19600 North, 75 m to the south of hole
BSDD260 intersected a 52.9 m gold mineralized zone grading 4.3 g/t
from 444.5 m drilled depth. Although these gold mineralized
intersections mentioned above are relatively deep, it adds
confidence to the Company’s interpretation and understanding of the
high grade mineralization at Wassa. At current gold prices it is
uncertain whether this deeper mineralization could be exploited by
open pit mining however the Company is now able to project the zone
down plunge and investigate whether the high grade is continuous
enough for underground mining methods.

Drilling on sections 19800 North and 19850 North infilled drill
hole spacing exceeding 85 m and returned gold grades greater than
holes up and down dip with hole BSDD285 and BSDD262 intersecting
27.9 m grading 5.0 g/t from 439 m and 47.1 m grading 7.2 g/t from
349.7 m, respectively. These wider and higher grade drilling
results are expected to have a positive effect on the estimated
grades in this area when the Company’s resource models are updated.
Other significant drilling results are tabulated below with
complete drilling results available on the Company’s website.

Work has commenced on the resource model update and the Company
expects to have this report completed in Q3 2013. At that time the
evaluation of both the open pit and potential underground viability
will be assessed. Pending the completion of the resource
estimates and evaluation of the economics of the higher grade
deeper material, further drilling to test the zone down dip has
been deferred.

Sam Coetzer, President and CEO of Golden Star commented, “It is
now time to look closely at the drilling results that we have
compiled since the last resource model update at the end of August
2012 and assess the economic viability of the deeper mineralization
at the current gold prices. Grade control drilling has focused
on the up dip projection of the Wassa high grade zone where it
daylights in the Starter pit area, with results from this drilling
confirming the higher grades intersected by exploration drilling
and adding further confidence to our geologists understanding of
this deposit.”

Wassa Main Q2 2013
Significant Drill Intersections: