Camissombo – Moquita – Lucapa – Saurimo – Malanje – Luanda: ida e volta

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A caminho do trabalho – garimpo na Lunda Norte

Um projecto de prospecção e exploração de diamantes de aluvião levou-me, de novo, a Angola.

Estreámos uma nova tecnologia (um drone acabado de comprar; como vivemos até agora sem um?), revimos velhos amigos e fizemos novos conhecimentos, falámos com garimpeiros e ouvimos a chamada muçulmana para as orações às 4 da manhã no Lucapa, experimentámos uma (para nós) inédita viagem por estrada Camissombo – Moquita – Lucapa – Saurimo – Malanje – Luanda, atravessámos e viajámos no rio Luachimo.

Viajo (e trabalho) há vinte cinco anos para Angola; nenhuma viagem foi tão intensa. Os filmes e as fotos que irei publicando ao longo das próximas semanas são para mim forma de não esquecer; para quem já lá viveu, pretexto para recordar.

A Sínese é uma empresa especializada em Geologia Económica e Análise e Sistemas Inteligentes. Fundada em 1995, a Sínese realizou estudos técnicos, económicos e de mercado, desenvolveu sistemas de informação especializados, concebeu e implementou projetos de prospecção, avaliação, mineração de recursos minerais em diversos países e continentes – Europa (Portugal), África (Angola, República do Congo, África do Sul, Angola) e nas Américas (Canadá, Estados Unidos, Brasil, Argentina, Uruguai e Equador).
Em particular, a Sínese esteve envolvida em inúmeros projetos ligados à prospecção e mineração de diamantes jazigos aluvionares e quimberlíticos em Angola e no Brasil, de pedra natural em Portugal, no Brasil e em Angola e de ouro e/ou nióbio e tântalo (nomeadamente aluvionares) em Portugal e na República do Congo, manganês e outros metais no Brasil.
A Sínese, coordenada por Luís Chambel – luischambel@sinese.pt , é constituída por uma equipa coesa, flexível e altamente qualificada, com especialistas em diversas disciplinas técnicas e científicas, desde a Engenharia de Minas, Geológica Económica e Aplicada, Sistemas de Informação Geológica, Estatística e Análise de Dados.

LULO (Lucapa Diamond Company) 1,539 ct parcel sold at 1.500 USD/ct

Lucapa Diamond Company Limited (ASX: LOM) just announced the sale of a fourth parcel of diamonds from the Lulo Diamond Concession in Angola for gross proceeds of A$2.9 million as alluvial mining operations at the project continue to ramp up.

The sale represented an exceptional average price of A$1,870/carat (US$1,500) for the 1,539 carat parcel, demonstrating the exceptional quality and premium value of the alluvial diamonds being currently mined at Lulo.

The latest sale brings to ~A$9.7 million the gross proceeds generated to date from the sale of four parcels of Lulo diamonds totalling 3,856 carats. This represents an average overall sale price of more than A$2,500/carat.

To obtain the news release, just click Fourth-Parcel-of-Lulo-Diamonds-Sells-for-A2.9-Million.

The source of diamonds in the Diamantina (Minas Gerais) region: Fm. Sopa – Brumadinho

Conglomerado Sopa (Sopa – Guida outcrop)

The precambrian Sopa Conglomerate is the source for modern alluvial diamonds deposits in the Diamantina (Minas Gerais) region. This old secondary formation is being reworked by the rivers in the area, releasing the diamonds it stores (themselves originated in primary, still unidentified, sources) into modern alluvia. Both the old conglomerate (Fm. Sopa – Brumadinho – Espinhaço Supergroup, Middle Proterozoic) and modern alluvia have been mined for diamonds since the early XVIII century in the region, in the process giving birth to diamond’s Modern Era.

Several outcrops may be visited in the area: the pictures I have included in the https://xmbl.wordpress.com/geology-rocks-formations-and-places/history-churches-diamonds-and-gold-in-minas-gerais-s-joao-del-rey-diamantina-2004/ photo gallery are from Lavrinha (Campo de Sopa – Guinda), a short travel from Diamantina. Many other outcrops are visible in the region.

You may also read the geological site description (in Portuguese, just an English abstract) in an article by Mário Chaves and Ítalo Meneghetti Filho available here: sitio036.

DIAMANG: the old times, a new photo gallery

DIAMANG 1960 - Luembe river diversion works
Luembe river diversion works – 1960 (DIAMANG)

Many people and institutions have been involved in the Angolan diamond industry during the last 100 years; places and natural features unknown until then have fallen under the spotlight of the industry. Among those involved, some had a leading role. DIAMANG was the greatest among them; this gallery (in time, a set galleries) honors the Company and the men and women that built it.

Alluvial sampling and kimberlite at LUCAPA’s (ASX:LOM) Lulo project

Lucapa Diamond Company Limited (ASX: LOM) recently released some reports containing information (grade and stone size) on the samples recovered in their Lulo concession – our post of December 19 about the scheduled start of the alluvial operations.

The releases are detailed but we decided to extract the locations of their reported sampling pits and kimberlite and convert it to kmz layers so that you are able to feel first hand the information by browsing it with Google Earth or another suitable application. Consider it a late New Year gift from Sínese or a way to celebrate this blog’s 50th post.

The layers are:

Just click on the links to download them; open them in Google Earth. Enjoy.

For further information or advice on this or other diamond project (Angola or elsewhere), contact us at luischambel@sinese.pt or use the contact form.

Congo Brazzaville – Mayoko photo gallery

Congo feb2013

Congo Brazzaville – first trip

Pointe Noire to Mayoko and back (february 2013)

A short but intense field trip to study the columbo-tantalite deposits in the area. Deep in the dense forest. Friendly people. Nb-Ta and Au alluvial deposits; Nb-Ta pegmatite source. Greenstone belt relic (with iron deposits).