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Exhibit 71 Hydrologic Chazacterization South of the Divide Area and Monitoring Plan 17 • Table 7 Summary of the Surface Water Monitoring Plan m Moaitoriug Statoou Monitored Area Flow Mwsurem<ut Field WQ Auuual Lab Weter Period of Record (pH, EC, T) Quality Su ace Slafio nsU er N. Fork Oraina eBosin er Dee Creek adient of SE mine anels nstantaneous, 3 x Year 1`I 3 x Year Peak Flow Period co 1996 [o resent ower Dee Creek own- adient of SE mine anel nstantaneous, 3 x Year t'/ 3 x Year Peak Flow Period o/ 1996 to resent own-gradient of Box Canyon ox Can on anels nstantaneous, 3 x Year 3 x Year Peak Flow Period m 1999 to resent p-gradient of mine facilities and Low Flow Period, Peak orth Fork U r SGS fine dischar e. ontinuous 3 x Year Irri anon Season ~'~ ] 977 to resent p-gradient of mine surface acilities azea and NE mine er S Nester Gulch anels nstan[aneous, 3 x Year 3 x Year Peak Flow Period o1 1977 to resent own-gradient of mine water ischarge point and NE mine fiddle S Nester Gulch anels ontinuous 3 x Year Peak Flow Period m 1977 to resrn[ own-gradient of mine surface acilities area and NE mine ower S Nester Gulch anels nstantaneous, 3 x Year 3 z Year Peak Flow Period 1'1 1977 to resent er Raven Gulch [ of W. Flatiron Area nstantaneous, 3 x Year 3 x Year Peak Flow Period m 005 to resent ower Raven Gulch t of W. Flatiron Area nstan[aneous, 3 x Year 3 x Year Peak Flow Period "~ 005 to resent Sur ace Stationr LowerN. Fork Drains a Basin own-gradient of mine facilities Low Flow Period, Peak orth Fork Lower d mine dischar e. ns[antaneous, 3 x Year 3 x Yeaz Irti anon Season cs) 1935- resent ithin completed NW mine ower Gribble Gulch anel area nstantaneous, 3 x Year 3 x Year Peak Flow Period m 1977 to resent Sur nce Sradons Minnesota Creek Drains a Basin p-gradient of un-mined SE coal ick Creek Flume ease area ontinuous 3 x Year Peak Flow Period o> 1977 to resent p-Gradient of Dry Fork and st of un-mined SE coal lease er Minnesota Creek SFS ea ontinuous 3 x Year Peak Flow Period (~l 1977 to resent ee Creek Ditch baseline tO oath of the Divide Area ontinuous 6 x Year 6 x ear al 006 e Creek Ditch normal I`1 oath of the Divide Area ontinuous 3 x Year Peak Flow Period o' 007 to future 1977 to present ontinuous and elocated in 2005 er Fork Fiume (baseline oath of the Divide Area nstantaneous 6 x Year 6 x Year R7 aseline in 2006 1977 ro present er D Fork Flume normal ontinuous 3 x Year Peak Flow Period m 007 -future fiddle D Fork Flume oath of the Divide Area ontinuous 3 x Year Peak Flow Period f ~ 1977 to resent ast Gulch, Fast of Horse Gulch oath of the Divide Area nstantaneous, 3 x Year 3 x Year Peak Flow Period m 1977 to resent eer Creek baseline oath of the Divide Area nstantaneous, 6 x Year 6 x Year 6 x Year m 005 ett Creek (normal nstantaneous, 3 x Year 3 x Year Peak Flow Period a> 006 to future oison Gulch (baseline South of the Divide Area nstantaneous, 6 x Year 6 x Year 6 x Yeaz 1n 005 oison Gulch normal nstanraneous, 3 x Year 3 x Year Peak Flow Period al 006 io future innesota Reservoir Flume baseline)1`I oath of the Divide Area ontinuous 3 x Year Peak Flow Period w 006 to future innesota Reservoir Flume normal t`I oath of the Divide Area ontinuous 3 x Year 6 x Year a> 007 [o future own-gradient of SE mine anels and un-mined SE coal owtt D Fork Flume ease area ontinuous 3 x Year Peak Flow Period " 1 1977 co resent aseline starting in oath Pron Creek w ouch of South Pron Creek nstantaneous, 6 x Year 6 x Year Peak Flow Period al 017 own-gradient of Dry Fork, SE 1937-1947 and ower Minnesota Creek SGS fine els, and SOD area ontinuous 3 x Year Peak Flow Pttiod (V 1965 to resent Stations listed upstream to downstream relative to WEM 1) For sites with more than 5 years of data, lab parameters include TSS, TDS, Cond., pH, and Fe (disc & tot) 2) For sites with less than 5 years data see Table 6 3) North Fork Stations lab parameters include Table 6 plus chromium, nickel, silver, cyanide, nitrite, and nitrate 4) New additions to monitoring program April 2006 AydroGea, Ina