Quarry
AG — Quarry Aggregate Plant
A 250 t/h quarry line producing three EN 12620 products, with the screen cut points fixed before the cone is sized.
- Rated
- 250 t/h
- First set
- 14 weeks
Hard rock crushing, from sample to signed sheet — Sheffield
We write the mass balance. We cut the steel. We sign the first-ore sheet.
Ridgecast designs, builds and commissions crushing, screening and conveying plants for hard-rock mines and quarries. Capacity is calculated from your rock, not quoted from a catalogue: no sample, no number.
400 t/h
Rated open-pit circuit
16 weeks
First-set lead time
280 MPa
Hardest rock we design for
1 set
Of drawings, frozen and signed
01Circuits
Three ways in, chosen by the ground you are working
An open-pit plant, an underground transfer station and a quarry line are three different design problems. Each circuit states the capacity it was rated at and the rock that rating was calculated on.
Open pit
OP — Open-Pit Crushing Circuit
A 400 t/h open-pit circuit with primary crushing at the pit edge and secondary screening in one steel tower.
- Rated
- 400 t/h
- First set
- 16 weeks
Underground
UG — Underground Transfer Plant
A 180 t/h transfer station designed to the roadway cross-section, inside 4.2 m of clear height.
- Rated
- 180 t/h
- First set
- 20 weeks
02Machines
The machines, stage by stage
Units are listed by the stage they work in, with the drawing number parts are ordered against and the range each one was sized for.
- RC-VF1100 Vibrating Grizzly Feeder Feed 400–600 t/h on granite run-of-mine, bed depth 250–350 mm 12 weeks
- RC-J1200 Jaw Crusher Primary crushing 380–520 t/h granite, CSS 125–200 mm 16 weeks
- RC-C900 Cone Crusher Secondary crushing 180–260 t/h closed circuit with RC-S2460, CSS 12–38 mm 18 weeks
- RC-S2460 Triple-Deck Screen Screening 250–400 t/h depending on cut points and deck media 14 weeks
- RC-B1200 Overland Conveyor Conveying 600 t/h at 1.6 m/s belt speed 10 weeks
03Services
From the sample to the first-ore sheet
Three stages: before the steel, on the pad, and for the life of the pit. Each one states what the mine has to provide and what is signed at the end.
Before the steel
Circuit Design and Mass Balance
The balance sheet that fixes every number downstream, run from the mine's own sample before any steel is cut.
15 working days for the first balance
For the life of the pit
Wear Parts and Relines
Wear parts and relines against the original drawing number, forecast from the commissioning baseline.
3 weeks ex-works on stock items; drawn-to-order parts quoted per item
On the pad
Erection and Commissioning
Erection supervision and first-ore commissioning, ending in one signed sheet rather than a handshake.
8–12 weeks on site, depending on the circuit
04Method
From a sample log to a frozen revision
This is the routine the design service runs, in the order it runs it. What comes out of the last step is what the steelwork is cut to.
Circuit Design and Mass Balance-
Sample log
Log the sample: where it came from, how it was taken, how much of it there is. A balance from an unrepresentative sample is worse than no balance.
-
Crushability testing
Crushability and abrasion index on the submitted rock, plus the 200 kg particle-size distribution.
-
Flow sheet and balance
Build the flow sheet: every stream, every cut point, every circulating load.
-
Machine sizing and steel list
Size the machines against the balance and list the steelwork that carries them.
-
Freeze the revision
Issue, date and lock the revision. Changes after this point are revisions, not conversations.
05Field notes
What we argue about, in writing
Quoting, selection, wear and site work: the four places where a plant goes wrong before it is built.
What a crushing plant quote actually needs
A price without a sample, a product split, a setting and a scope boundary is not a quote — it is a range wide…
Underground crushing: designing to 4.2 m of clear height
A transfer station inside 4.2 m of clear height is a transport and assembly problem before it is a crushing problem — and the…
Wear parts by drawing number, not by description
A description fits several machines and some of them will not close. The drawing number is the only identifier that carries tooth profile, thickness,…
06The works
One address for the drawing desk and the machines
Quotations, drawings and wear-part orders come off the same site, which is why a question about a liner can be answered against the drawing it was cut from.
- Works
- Unit 2, Forge Park, Sheffield S9 1HF, United Kingdom
- Applications
- +44 (0)114 244 0180
- Wear parts
- +44 (0)114 244 0182
Send the rock, not the wish list.
A 200 kg sample and the product list you want to sell is enough for us to price a circuit. Without the sample we will tell you so rather than guess.