Renunciation of areas covered by Exploration Concession.
Article 50
ART. 50. Renunciation of areas covered by Exploration Concession.—The holder of an Exploration Concession may, at any time, renounce the whole or any part of the total area covered by his concession: Provided, That, in case of partial renunciation, the portion retained shall be not less than twenty thousand hectares, unless the same is contiguous to another exploration block or blocks held by the same concessionaire, in which case, the total area of all the contiguous blocks thus retained for exploration shall be not less than twenty thousand hectares.