Waihi Underground Mine Report - August 2002.

List of Figures
(Click on the figures listed in bold below to view)
Figure 1 (1.5MB) 1924 plan of Waihi showing location of lodes and mine facilities
Figure 2 (236.2KB) Plan of lodes (red) in Waihi & Waihi Grand Junction mines in 1924
Figure 3(a)
Figure 3(b)
Figure 3(c)
Figure 3(d)		 (418.8KB)    (464.1KB)    (483.7KB)    (449.3KB)   Vertical cross-sections through the Martha Hill lodes (1924)
Figure 4(a) (398.8KB) Map of Waihi showing the location of mine stopes, collapses, and stope cross-sections.
Figure 4(b) (1.78MB) Map of Waihi showing locations of shafts.
Figure 5(a) (2.97MB) Aerial photo of Waihi showing collapse areas, the open pit and probabilistic hazard zones – circles around shafts, elongated areas above lodes.
Figure 5(b) (2.02MB) Probabilistic ground subsidence hazard zones overlying mine stopes and shafts.
Figure 6(a) (142.3KB) Location of 2001 collapse crater and associated ground cracks with Royal Stope hazard zones (WGM).
Figure 6(b) (149.2KB) 1999 and 1961 collapse craters with 1999 ground cracking and the Royal Stope hazard zones.
Figure 7(a)
Figure 7(b)		 (123.8KB)    (161.1KB) Long sections of stopes and levels in the Royal lode (WGM).
Figure 8(a)
Figure 8(b)		 (110.3KB)    (144.5KB) Long sections of Edward lode showing stopes and levels (WGM).
Figure 9(a)
Figure 9(b)		 (43.9KB)    (59.0KB) Long sections of Empire lode showing stopes and levels (WGM).
Figure 10 (567.6KB) Royal, Edward and Empire lodes simplified long sections showing unique stope identifier,
volume, average thickness, whether filled and surface hazard.
Figure 11 (47.4KB) Cross-section A-A’ through the Royal stopes at the 1999 collapse. Probabilistic hazard zonation is shown illustrating buffer technique employed in this study.
Figure 12 (60.0KB) Cross-section B-B’ through the Royal stopes at the 2001 collapse. Probabilistic hazard zonation is shown illustrating the buffer technique employed in this study.
Figure 13 (39.3KB) Cross-section C-C’ through the Edward stopes. Probabilistic hazard zonation is shown illustrating the buffer technique employed in this study.
Figure 14 (46.9KB) Cross-section through the Empire stopes. Probabilistic hazard zonation is shown illustrating the buffer technique employed in this study.
Figure 15 (183.4KB) Transform view of the Royal stopes looking towards the NW.
Figure 16 (81.3KB) View of the western part of the Royal stopes looking towards the north.
Figure 17 (261.7KB) View of eastern Royal stopes looking towards the NW.
Figure 18 (173.6KB) Transform view of the Royal and Edward stopes looking towards the east.
Figure 19 (205.4KB) Transform view of the Royal and Empire stopes looking towards the SE.
Figure 20 (232.9KB) Pit limits showing Andesite & Ignimbrite zones.
Figure 21 (692.2KB) Section through pumphouse area showing distribution of soil and rock types.
Figure 22 (40.6KB)  Summary properties of rock and soil materials.
Figure 23 (39.9KB) Frequency distribution for strength of rock and soil types.
Figure 24 (28.1KB) Engineering data from W20 & W21 logs.
Figure 25 (56.9KB) Example of RMR calculations sheet.
Figure 26 (524KB) Defect patterns in southern domains of pit.
Figure 27 (36.8KB) Main defect sets in southern domains of pit.
Figure 28 (174.5KB) Stability graph method.
Figure 29 (76.1KB) MRMR stability diagram.
Figure 30(a), (b), (c), (d) (170.7KB) Formation of chimneys above mine workings.
Figure 31 (54.8KB) Type and amount of void migration.
Figure 32 (125.3KB) CANMET crown pillar stability method.
Figure 33 (56.5KB) Examples of output from CPILAR program.
Figure 34 (52.0KB) Data input for stability graph.
Figure 35 (1.15MB) Stability assessments of stope below 1961 subsidence.
Figure 36 (42.6KB) Probability calculations for height of void migration.
Figure 37 (27.4KB) CANMET plot of crown pillars relevant to prior collapses.
Figure 38 (45.4KB) Caving break back angles from hanging wall collapse.
Figure 39(a) (1.01MB) Void above stope RO135 as indicated by large core loss in RDH6 (long-section view).
Figure 39(b) (34.2KB) Void above stope RO135 – viewed in cross-section.
Figure 40 (38.2KB) Definition of hydraulic radius.
Figure 41 (25.2KB) Definitions of angles of draw and break.
Figure 42 (553.0KB) Total ground settlement contours (orange), settlement values (mm) and survey points, with stopes and shafts, and collapses.
Figure 43 (2.53MB) Areas of former swampy ground and fill at Waihi (URS).
Figure 44 (116.4KB) Summary of historical pumping rate and water levels (URS).
Figure 45 (43.5KB) Probability analysis of worldwide blast cracking data.
Figure 46 (32.5KB) No. 5 shaft subsidence area and cross-section.
Figure 47 (29.0KB) Comparison of risks.
Figure 48 (1.58MB) Probabilistic hazard zones for stopes and shafts.
Figure 49 (949.7KB) Property ownership.