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Table T1. Operations, Site M0062.

Core Coring
method 		Date
(2013) 		Time
(UTC) 		Depth (mbsf) Recovered
(m) 		Recovery
(%) 		Mud type Comments
Top Bottom
347-M0062A-
    5 Oct 1810           Arrived on site
    5 Oct 1830           Template down
    5 Oct 1910           Drill string down
    5 Oct 1930           Checked depth through clamps
1O NCA 5 Oct 1940 0.00 0.50 0.00 0 Seawater Washed down to avoid potential seabed contamination
2H PCS 5 Oct 1946 0.50 3.80 3.36 101.82 Seawater 75 bar
3H PCS 5 Oct 2022 3.80 7.10 3.40 103.03 Seawater 65 bar
4H PCS 5 Oct 2054 7.10 10.40 3.41 103.33 Seawater 75 bar
5H PCS 5 Oct 2140 10.40 13.70 3.36 101.82 Seawater  
6H PCS 5 Oct 2230 13.70 16.40 2.81 104.07 Seawater Difficulty in pulling back overshot, suspect due to sand
7H PCS 5 Oct 2303 16.40 19.70 3.29 99.7 Guar  
8H PCS 5 Oct 2340 19.70 23.00 3.19 96.67 Guar  
9H PCS 6 Oct 0022 23.00 26.30 3.16 95.76 Guar  
10H PCS 6 Oct 0057 26.30 29.30 2.73 91 Guar  
11H PCS 6 Oct 0130 29.30 32.60 3.21 97.27 Guar  
12S HS 6 Oct 0215 32.60 32.60 0.00 0 Guar 15 blows, no recovery save a few sand grains
13H PCS 6 Oct 0238 32.60 35.90 3.15 95.45 Guar No apparent fire pressure, 150 bar, down to 100, then back up; this repeated a couple of times before falling to zero without moving the pipe; full core recovered mainly sand with a small amount of silty clay at top
    6 Oct 0310           Called end of borehole as back in sand and clay
    6 Oct 0315           Started to prepare to trip the pipe
    6 Oct 0334           Seabed template off the seabed, moved to Hole M0062B
347-M0062B-
    6 Oct 0423           Arrived on site
1O NCA 6 Oct 0438 0.00 1.00 0.00 0 Seawater  
2H PCS 6 Oct 0445 1.00 4.30 3.49 105.76 Seawater Smooth firing and pressure reduction
3H PCS 6 Oct 0515 4.30 7.60 3.46 104.85 Seawater Smooth firing and pressure reduction
4H PCS 6 Oct 0545 7.60 10.90 3.48 105.45 Seawater Smooth firing and pressure reduction but not to zero initially
5H PCS 6 Oct 0610 10.90 14.20 3.21 97.27 Seawater Fired and dropped pressure, then rose to 135 bar and stopped before clearing when pipe lifted; good core but silt at base; changed overshot pins
    6 Oct 0650           Did not pressure up; retrieved to inspect; all intact and seals fine; pumped mud into the hole before retrying
6H PCS 6 Oct 0710 14.20 17.50 3.21 97.27 Seawater Smooth firing and pressure drop; required two attempts to pull corer out of BHA; good core; no shoe sample
7H PCS 6 Oct 0750 17.50 20.80 3.25 98.48 Seawater Smooth firing but erratic pressure reduction
8H PCS 6 Oct 0815 20.80 24.10 3.20 96.97 Seawater Good silty core.
    6 Oct 0825           End of hole
    6 Oct 0840           Tripping pipe
    6 Oct 0900           Bumped over to next location
347-M0062C-
    6 Oct 0900           Arrived on site
    6 Oct 0920           Prepared to take sample from seabed down without seabed template on seafloor
1H PCS 6 Oct 0930 0.00 3.30 3.43 103.94 Seawater Fired at 80 bar and down to zero; full stroke
347-M0062D-
    6 Oct 1000           Arrived on site
1O NCA 6 Oct 1025 0.00 1.50 0.00 0 Seawater Washed down to create core run offset for composite splice
2H PCS 6 Oct 1035 1.50 4.80 3.45 104.55 Seawater Smooth firing and pressure reduction
3H PCS 6 Oct 1105 4.80 8.10 3.43 103.94 Seawater 55 bar, smooth firing and pressure reduction
4H PCS 6 Oct 1145 8.10 11.40 3.41 103.33 Seawater 34 bar only
5H PCS 6 Oct 1220 11.40 14.70 3.47 105.15 Seawater  
6H PCS 6 Oct 1255 14.70 17.70 3.00 100 Guar  
    6 Oct 1335         Guar Pressure up to 220 bar with no lowering until release valve opened; on recovery found that piston had not fired and seal had been lost; recovered to deck and serviced
7H PCS 6 Oct 1405 17.70 21.00 3.30 100 Guar Pressure wavered around 75 bar and dropped right back to zero
    6 Oct 1425           End of hole
    6 Oct 1425           Washed out remainder of API pipe to form rathole for logging
    6 Oct 1440           Tripped pipe to 1.5 mbsf
    6 Oct 1640           Logging: 2 runs before hole closed at 7 mbsf

HS = hammer sampler, NCA = noncoring assembly, PCS = piston coring system. BHA = bottom-hole assembly, API = American Petroleum Institute size drill pipe.

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