Abstract: A system (10) for monitoring coring operations including a core sample marker (24) to rest in use on the top of a drilled core sample (14) within a core barrel (16). A cable (26) is connected at a first thereof to the core sample marker (24) and a cable tensioner (30) is provided above the core sample marker (24) to apply tension to the cable (26). A cable movement detector (32) is provided such that as the drilled sample (14) moves up the core barrel (16), the cable tensioner (30) draws the cable (26) up the core barrel (16) and the cable movement detector (32) determines the length of cable (26) drawn up the core barrel (16), thereby providing information regarding the distance traveled by the core sample marker (24).

Abstract: A system (10) for monitoring coring operations including a core sample marker (24) to rest in use on the top of a drilled core sample (14) within a core barrel (16). A cable (26) is connected at a first thereof to the core sample marker (24) and a cable tensioner (30) is provided above the core sample marker (24) to apply tension to the cable (26). A cable movement detector (32) is provided such that as the drilled sample (14) moves up the core barrel (16), the cable tensioner (30) draws the cable (26) up the core barrel (16) and the cable movement detector (32) determines the length of cable (26) drawn up the core barrel (16), thereby providing information regarding the distance travelled by the core sample marker (24).