Drilling Results

Tertiary Minerals PLC
20 June 2000

 
TERTIARY MINERALS PLC
 
DRILLING AT WINDFALL EXTENDS KNOWN MINERALISATION
 
Parallel Zone Of Mineralisation Also Encountered 
 
Tertiary Minerals reports that a further round of drilling at it's Windfall
project in the historic Bergslagen mining district of south central Sweden
has extended the strike length of known mineralisation and encountered a
parallel zone of mineralisation. However, testing of Induced Polarisation
(IP) geophysical targets has shown that this exploration technique has no
further application in this area. 
 
Ten diamond drill holes have been completed for a total of 1,077m.
Significant results are shown in the table below and include best results of
1.6m of 18p.c. zinc, 6p.c. lead and 160g/t silver in hole 00VD104 at the
Vindfall prospect and 0.5m of 28p.c. zinc, 13p.c. lead and 63g/t silver in
hole 00SD109 at Sortarnan. A schematic plan showing the location of these and
previous Company drill holes is available from the Company. 
 
Four holes at the Vindfall prospect tested an IP anomaly in the footwall of
the known mineralisation and for extensions of mineralisation on the
north-east end of the Vindfall zinc-silver mineralised zone. 
 
Hole 00VD104 was designed to follow up mineralisation encountered in a 1997
reverse circulation drill hole (97VR109, which intersected 4m at 9.7p.c.
zinc, 2.4p.c. lead, 0.3p.c. copper and 30g/t silver), and also to test at
depth a shallow-dipping IP anomaly in the footwall of the known zinc-silver
zone. The high grade intersection reported above for hole 00VD104 is believed
to extend the mineralisation in 97VR109. The IP anomaly is explained by a
parallel zone of barren skarn alteration. 
 
Holes 00VD105 and 106 were drilled approximately 100m north-east of the
previously known limit of mineralisation at Vindfall. An intersection of 3m
of 2.7p.c. zinc, 0.9p.c. lead, 0.1p.c. copper and 23g/t silver from 12.90m
depth in 00VD106 demonstrates that it is continuing in that direction and
remains open-ended. 
 
Hole 00VD103 tested a strong IP anomaly in a demagnetised zone in the
footwall of the Windfall mineralisation but encountered only small amounts of
haematite and pyrite in granite. 
 
Six holes were drilled to test targets at Sortarnan which lies 1500m
north-east of, and along strike from, Vindfall. 
 
Holes 00SD106-108 and 00SD112 tested geophysical IP targets but only barren
skarn altered horizons were intersected. 
 
Hole 00SD109 tested the main Sortarnan zinc-silver zone up dip from a
previous drill intersection (00SD104 which intersected 7.7m at 10.9p.c. zinc,
4.3p.c. lead and 0.4p.c. copper and 96g/t silver). A narrow intersection of
very high-grade mineralisation was made in the predicted position. Perhaps
more significantly, hole 00SD109 collared in mineralised bedrock with the
first meter of rock beneath the transported overburden assaying 3.9p.c. zinc,
3.3p.c. lead, 0.38p.c. copper and 113g/t silver. This represents a new zone
of mineralisation not tested by any of the company's previous drill holes. It
is not known if this represents the true thickness of mineralisation at this
point or if the hole has clipped the edge of a wider zone of mineralisation.  
 
Hole 00SD110, drilled approximately 50m north-east of the limit of the
Company's previous drilling at Sortarnan, did not intersect the normally
mineralised skarn altered carbonate host rock and it is thought that faulting
may have displaced this zone to the north-west. 
 
The Company is encouraged that extensions have been found to the Vindfall
prospect and that a second zone of mineralisation has been found at
Sortarnan. However, the mineralisation is structurally complex and cannot be
outlined by IP geophysical methods. The Company is now planning a detailed
geochemical sampling programme to delineate further extensions to the
mineralisation which remains open in most directions. 
 
Further information: 
 
Patrick Cheetham, Executive Chairman, Tertiary Minerals 
Tel: (00 44) (0) 1625 626203 or visit the Company's website :
www.tertiaryminerals.com 
 
                                  WINDFALL PROJECT
 
                         MAY/JUNE 2000 DRILLING PROGRAMME
 
                   TABLE OF SIGNIFICANT DRILL HOLE INTERSECTIONS*
 
                                                                              
   Hole No.          Drill    Zinc     Lead    Copper    Silver         From 
              Intersection       %        %         %       g/t    (downhole) 
                         m                                (ppm)            m 

   VINDFALL PROSPECT                                                    

    00VD104          1.90m    0.8%     0.7%      0.0%        15        54.00m 
            
                     7.40m    4.3%     1.4%      0.1%        64        63.60m 
  Including          1.61m   18.0%     5.7%      0.2%       160        68.39m 
  Including          0.90m   31.4%     9.9%      0.2%       256        68.60m 

    00VD106          3.25m    2.7%     0.9%      0.1%        23        12.90m 
  Including          0.30m    7.5%     1.4%      0.0%        25        15.60m 

  SORTARNAN PROSPECT                                                    

    00SD109          1.05m    3.9%     3.3%      0.4%       113         7.30m 
  Including          0.60m    6.2%     5.4%      0.3%       169         7.60m 

                     2.15m    1.0%     0.7%      0.4%        91        10.50m 

                     2.45m    2.1%     0.7%      0.1%        22        19.70m 
  Including          0.60m    4.1%     0.4%      0.1%        29        19.70m 

                     1.20m    2.1%     0.7%      0.1%        20        33.50m 

                     0.40m    0.2%     0.9%      0.0%         -        36.50m 

                     0.50m   28.5%    13.1%      0.2%        63        36.90m 

                     1.00m    0.7%     0.4%      0.0%         -        39.60m 

                     0.25m    6.6%     2.1%      0.0%        21        42.75m 
 
* Sample intervals assaying greater than 1% combined zinc+copper+lead