Donnybrook Cricket Club has booked a place in the Bunbury and Districts Cricket Association 2018/19 - Second Grade grand final.
The Dons inched closer to the minor premiership with a four-wicket win over Collie in round 16, last month.
Coalminers' opening batsman Bailey Moloney got the ball rolling with 54 runs (including three fours), before Mark Williams added 29 to Collie's total.
The visitors fell to 3/64, after Bradley Swarbrick caught top order batsman Blair Malatesta (4).
Matthew Hislop (28 not out) and Gagan Sidhu (16) were the only two middle/lower order batsmen to reach double figures.
A lower order collapse saw Collie reach a respectable total of 155 after 48.3 overs.
Donnybrook's inning began with solid spells from Phillip Welsh (23) and Mitchell Clothier (17).
Once again, middle order batsmen James Harcourt (41 not out), Paul Reynolds (39), and Armaan Randhawa (22) impressed with the bat.
The Dons went on to reach Collie's total with 8.3 overs remaining.
Donnybrook scored a bonus point, following a resounding four-wicket win over Harvey-Benger in round 17.
Harvey-Benger opener Haydn Jones (19) and captain Scott Fowler (16) upped the home side's run rate early on.
Middle order batsman Francois Roelofsz (44) and tailender Johnny Crognale (34no) helped the side to reach 157.
Mark Manea (41) and Welsh's (28) formidable partnership troubled Harvey-Benger bowlers.
Wicketkeeper Bradman May knocked 31, before Randhawa (19) and Troy Skippings (15) worked their magic at the crease.
The Dons made Harvey-Benger's total after 37.1 overs.
Donnybrook claimed the minor premiership, after its round 18 clash with Marist was washed out.
Collie and Donnybrook played out a blistering semi-final on Saturday, March 16.
The Coalminers celebrated after dismissing Manea (11) and Welsh (0) in quick succession.
After Donnybrook was stranded on 2/14, May delivered 143 during his 160 minutes at the crease. The top order batsman notched up an extraordinary 17 fours and two sixes.
Harcourt then did enough to make 43.
Chasing Donnybrook's formidable 7/267 total, Collie crumbled under pressure.
Openers Bailey Moloney (9) and Brayden Kent (5) failed to make an impression, while Mark Williams made 25.
Bowler Norman Bedford needed just 9.4 overs to take 4/25, before Donnybrook dismissed the Coalminers for 120.
The Coalminers took down Marist in last weekend's preliminary final.
Donnybrook will host the grand final at Egan Park on March 30.
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