Add design pattern for mines

[cmungall]

pattern_name: envo/patterns/mine

classes: 
  material extraction process: ENVO:01000785
  mine: ENVO:00000076

relations:
  has output: RO:0002234 
  capable of: RO:0002215

vars: 
  output: "'material entity'"

name: 
  text: "%s mine"
  vars: 
    - output

def: 
  text: "A mine that produces %s through a material extraction process."
  vars:
    - output

equivalentTo: 
  text: "'mine' that ('capable of' some 'material extraction process' and 'has output' some %s)"

  vars:
    - output

[cmungall]

Formally I think the material should be a subclass of ENVO material such as coal or ore. These can then be defined in terms of chemical composition using CHEBI.

So the pattern is indirect:

 mine --[capable of]--> pr --[has output]--> material --[composed of]--> chemical

[cmungall]

ENVO:01000785 ! material extraction process

A planned process during which a portion of environmental material is removed from a material entity.

When does the process start and end? E.g. for peat extraction (is this considered mining?) would drainage be the initial part, or preceding? What about transportation of extracted material?