Horizontal drilling:

Example of Horizontal Drilling

• Requires very skilled operatives.
• Need to drill precisely.
• Despite technological advances this method has a great potential to cause damage to other underground infrastructure.
• The machinery is very expensive.
• The machinery is large causing disturbance to motorists.
• This method is very slow.
• This method does not allow for the recovery of the copper.
• Requires a large volume of water during the process which can lead to eco damage.
• Best suited to green field developments.

Trenching:

Example of Trenching

• Slow work rate.
• Large capital expenditure in machinery.
• Large amount of disturbance to pedestrians and vehicles.
• High risk of damaging other buried infrastructure.
• High reinstatement costs.
• Planning and access issues.
• Adverse weather can cause delays.