20 MMD Mobile & Semi- Mobile Sizer S t ations O per a t ors ar e demanding mor e and mor e fe xible e x tr ac tion sy st ems , meaning pr oc ess equipmen t has t o be mor e adaptable t o suit the r ange of modern mining methods a v ailable . MMD has , thr oughout its e xist enc e , de v eloped purpose desig ned units t o suit an y mining method and ma t erial as r equir ed . T he whole r ange of Siz ers can be inc orpor a t ed in t o a wide r ange of tr anspor t options a v ailable t o suit the duties r equir ed . W heeled units T hese ar e r eally only suitable f or the smaller Siz ers due t o the limit ed car r ying capacit y on this t ype of desig n and the man y high w a y r estr ic tions no w imposed w or ld wide . T his st yle of unit is nor mally po w er ed b y a diesel eng ine and a h y dr aulic sy st em t o po w er the dischar ge c on v ey or and f eeder if ftt ed . T r ack M o dular units A n y of the Siz er r ange can be ftt ed t o this t ype of unit which can ha v e tr acks per manen tly installed or inc or por a t ed in a separ a t e tr anspor t er . T hese can be diesel or elec tr ic po w er ed and when the tr acks ar e ftt ed they can be lif t ed clear of the g r ound f or main t enanc e . T r ansp or table M o dular units A n y Siz er can be installed on this t ype of unit; the main dif er enc e is tha t the modules ar e desig ned t o be mo v ed on wheeled tr ailers . T hese units ar e nor mally elec tr ically po w er ed in the same manner as sta tic installa tions and desig ned t o suit the oper a t or ’ s pr ef er r ed method of tr anspor t . T r ack M oun t ed T his is pr obably the most v ersa tile method of moun ting the whole r ange of Siz ers and is adaptable t o the widest r ange of e x tr ac tion methods . T hese units can be elec tr ic , diesel or a c ombina tion of the t w o . I f the Siz er , F eeder and dischar ge c on v ey or ar e elec tr ically dr iv en, and the tr acks ar e dr iv en b y a diesel eng ine , the main supply cable can be disc onnec t ed dur ing r eloca tion. T r ailer M oun t ed T r anspor table | 750 S er ies Siz er F ully M obile T r ack M oun t ed | 750 S er ies Siz er F ully M obile T r ack -M oun t ed | 1300 S er ies Siz er | D7 A pr on P la t e F eeder T r ailer -M oun t ed and Sk id-M oun t ed T r anspor table | 625 S er ies Siz ers