Newfield Resources Limited announced an operational update in relation to its Tongo Diamond Mine Development in Sierra Leone. Kundu Return Air Way: The development of the Return Air Way (RAW) on Kundu Segment A towards the ventilation shaft continued. The RAW has been developed some 146m and there remains a further 46m before the ventilation raise is reached. The raise will be 2m x 2m in diameter and equipped with a travelling way (staircase) over a distance of 42m at a raise angle of 35-degrees from the RAW to the surface, to provide an escape way for mine personnel. The ventilation shaft at surface has been constructed where the raise will "hole out". Two 75Kw fans will be installed at the surface of the ventilation shaft which will draw air out of the mine providing through ventilation and safe mine working conditions. The RAW is being developed along strike (on reef) of the Kundu A kimberlite segment and each blast provides ore for stockpiling and processing via the 5tph plant. Kundu Decline: Blasting of the 4m x 4m Kundu decline continued from the split with the Kundu incline to the RAW and will be developed down at an 8-degree angle to reach the first mining level of Kundu Segment A, some 35m below the surface. A further 61m will be developed before the decline turns towards the Level-1 rock drive which will be developed for 55m the first cross cuts to the mining raise and stopes which will yield increased run of mine ore. Underground Support and Infrastructure: During development the underground support and infrastructure is progressively installed. This includes electrification, ventilation, compressed air and water pump stations. Some four pump stations have been constructed so far to dewater the mine and to provide dry working conditions. In addition, a rescue bay has been constructed for safe refuge of workers in the event of an underground incident. Outlook: The next two months will see the continuation of the Kundu A RAW development and commencement of the ventilation raise, recovering ore from Kundu A in the process. In addition, the Kundu decline will progress towards mining Level-1 of Kundu A where a rock drive will be developed eastwards towards the first cross cuts that will access the first fissure raise and mining stopes of Level-1.