Gramsay, in my opinion it would fall under CDM (Regulation 2(1)(e)). The CDM regs define a structure as (a) any building, timber, masonry, metal or reinforced concrete structure, railway line or siding, tramway line, dock, harbour, inland navigation, tunnel, shaft, bridge, viaduct, waterworks, reservoir, pipe or pipe-line, cable, aqueduct, sewer, sewage works, gasholder, road, airfield, sea defence works, river works, drainage works, earthworks, lagoon, dam, wall, caisson, mast, tower, pylon, underground tank, earth retaining structure or structure designed to preserve or alter any natural feature, fixed plant and any structure similar to the foregoing. I would imagine that HSE would consider the crusher / screen as "fixed plant". I read the exemptions as being the actual removal of the rock / material from the working face. This is covered by the Quarries Regulations. PH2

I have to agree with Dave, I regularly work for a company with 4 operational quarries and they change screens on a regular basis, just regular maintenance, and issue we did clarify with HSE about 5 years ago.

Are you replacing the screen mats or replacing the whole srceen structure? If you are only replacing the screen mats then this is just routine maintenance, if you are replacing the whole structure then it may come under CDM depending upon the time scale?manhours although from my experience if you are likely to take anywhere near this long I would doubt the competence to do the task. I'm also concerened at your reference to "changing a screen inside a fixed crusher".....? In my 30 years experience the screen deck is usually the next process after the crusher not an integral part of the crusher. I suggest you consult with competent staff at the quarry before taking on any task particulalry if you are not familiar with 1999 Quarry regs. Quarries can be very unforgiving place to make mistakes in and have very different regulatory controls than you may be familiar with.

Gramsay. It's not "construction work" see text in Reg 2(1) of CDM for definition following (e) "but does not include the exploration for or extraction of mineral resources......"