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河北北部某火山岩筒钴矿床的特点是:矿区附近出露的地层主要为震旦系石英岩、灰岩、板岩以及中生代的火山岩.钴矿床产于一个由震旦系石英岩中开口的古火山颈内.火山颈主要为酸至中性的凝灰角砾岩充填,其边部伴有震旦系岩层的角砾,并贯有一条粗面岩脉.凝灰角跞岩主要由安山岩、粗安岩和粗面岩的角块及碎屑组成.在这些火山岩的角块中气孔发育,形成标准的杏仁状构造.此火山颈的形状像不对称的喇叭,地表露出部分像喇叭口,上大下小,呈不规则的椭圆状、喇叭口的下部长约60～70米,宽约20米;地下埋藏部分相当喇叭的主干,形成陡倾角的不规则的筒状体(图5).
The characteristics of a volcanic rock cobalt ore deposit in the northern part of Hebei are as follows: the strata exposed near the mining area are mainly Sinian quartzite, limestone, slate and Mesozoic volcanic rocks. The cobalt ore deposit is produced from a paleo- The volcanic neck is mainly filled with acid to neutral tuff breccia, and its edge is accompanied by breccia of Sinian strata and a coarse dick vein. The tuffite hornite is mainly composed of andesite , Coarse rock and coarse rock corner blocks and debris formed in these corner blocks of volcanic rock stomatal development, the formation of a standard almond-shaped structure of the crater like asymmetrical horn neck, the surface exposed part of the bell mouth , The upper and lower small, irregular oval-shaped, the lower part of the bell about 60 to 70 meters long, about 20 meters wide; burial part of the horn quite trunks underground to form a steeply inclined irregular tube (Figure 5 ).